www.ford-trucks.com/forums/1753958-would-a-faulty-tank-selector-valve-cause-the-eec-to-cut-power-to-the-fp-relay.html Post number 8 at this thread has testing information on the selector valve.
John, I'm the OP KarlJay. I'm trying to fix my selector valve. The two rods move freely, but the two valves on the other side have lost their O rings. The 0.5 PSI anti siphon and the 20 PSI diverter valve. I'm trying to figure out how to get the O rings back in place. I can't tell if those valves come out from the body or not. I didn't find your part 2, is there any way you can tell me how to get to those two valves on the other side and what that hole nearest the pickup tube is for. Mine is packed with something and I can't tell if it's supposed to be clear or not, your's looks like a clear thru hole. @10:38 I can see a black O ring in the bottom, mine had a green one there and the black one coming out of the valve.
I'm assuming that Ford never intended that part to be serviceable/rebuildable since plastic does not last forever; generally degrades and becomes brittle; especially soaked in gasoline which is why yours broke I'm sure. Better to just replace a part like that with a new one. BTW; the clip you are referring to as a "C-clip" is actually an "E-clip"; they both accomplish the same thing but E-clips are made to be removed with a flat screwdriver and, generally, C-clips require C-clip pliers. Thanks for breaking into that for us. I threw mine away as it no longer functioned. I also broke the plastic retaining clips that secured the fuel lines to that aparatus; luckily those are replaceable.
that compression piston with the spring part on it is what sticks....lubricate the snot out of it, reassemble and should be good as new. there's another video of a mechanic doing this. that plate that was attached to the orange diaphram was left on the 2 pins coming out of the top of it in his video.
John thanks for the video. I know you are a busy person so if you don't have time to answer it's ok, I do understand. I have a 1987 F-150 4x4 with the 351 4bbl HO engine from the factory and it actually has the mechanical fuel pump for both tanks. Every single video I have seen on these tank switches everyone has electric fuel pumps and nobody will even acknowledge my simple question, is the tank switch the same for the mechanical pump, or do you know, cause it is tough getting info on these things. Both my floats have drowned so I never really know how much fuel I actually have and my switch works now and then but not dependabley. My front tank builds up a frightening amount of pressure after running about a half hour, so much pressure that when I open the filler cap pressure comes rushing out loudly and with tremendous force. Back tank never does this. I have been a FoMoCo guy all my life but never had a tank switch issue till now. I am 60 years old and just got out of the wheelchair 3 years ago so crawling under stuff blind is a real chore. I don't mind fixing things when I know what to look for and I have the knowledge about most stuff but I don't move so well anymore. I live 21 miles off the pavement in very rural Arizona off grid and I can't walk very far anymore after getting hurt, that is why I am asking all this cause running out of fuel can be a real problem for me, that is why I bought the dual tank truck. Lol. Its always something i reckon and sorry this was so long but I had to ask. Thanks for your time and blessings.
@@randallbates9020 1987 F150s came from the factory with fuel injection. It's likely that someone put a 351 from a 1987 Ford F250, in your truck. The F250s with 351s were carbureted in 1987. I don't know how they may have modified your truck. My guess is, that they used the stock Dual Function Reservoir (aka fuel tank selector valve), and are using the mechanical fuel pump, to draw gasoline from the reservoir, in the bottom of the Dual Function Reservoir. But that's just a guess. I would suggest going to a forum like Ford Truck Enthusiast forum, and posting your question there. You'll get a bigger knowledge base there. Maybe rig up a selfie stick and use the video function of your cell phone, to take a video of the fuel lines, in the area under the driver's seat, inside the frame rail, so you don't have to lay under the truck to see it. If my guess is right, there should be a skid plate bolted over the Dual Function Reservoir, and 6 fuel lines going to it.
Hoping you do part 2... I had the same small o-ring issue on the bowl side. it was pinched (half in half out) of the round passage with the spring loaded valve, again on the bottom (bowl side). Can't get figure out how to get reseated or if it even goes there or got sucked in??? Mine's an 1986, don't think the ones they sell work because the fuel line fittings are different. Thanks, Jon
For anyone having an issue with the O-rings in the bottom: plug all the holes and run about 100 psi of air and it blows it out and you can grab it and slide the O-ring back on. Only worked on the non return side for me. Hope this helps someone
@@johnd.9145 So I plugged the fuel inlets for both tanks. Earplugs and electrical tape. Whatever works. And then there’s the outlet that goes to the engine. Plug that one too. And then there’s the two holes in the plastic body. Cover those with electrical tape. Then you gotta remove that valve for the fuel side and I cut up a heater hose and jammed it in and stuck the air hose in the other. Hope that helps. If not maybe I can make a video and put it on my channel.
Hey I have a 1986 and I am getting some leakage due to the same thing I’m sure , I have a 1986 f150 these reservoirs seem to be identical what’s your thoughts on that? I haven’t found any videos that show this issue related to a 1986.
I had the same problem with selector valve leakage on my 87 F150. After looking at the mess ford made of the fuel system, looking at the cost of new parts, I put in 3/8 stainless lines to a real brass 3 way valve. That ford selector valve was designed by an idiot (on LSD). No more fuel system troubles. BONUS Turn the valve to the 3rd unused position and if someone tries to steal it, there is only the gas in the float bowls.
@@davidparks538 This link has really good information. www.supermotors.net/registry/2742/66025-2 According to the link, the filter was moved to between the in line fuel pump and the engine, in '86. So after '86, there should only be the external fuel filter
I'm sure there's a way to bypass this valve, but I don't know the details of how to do it. If you have two fuel tanks, you'll need some way to switch between them.
It sounds to me like people have successfully deleted the reservoir by adding a later model in tank fuel pump. I'm pretty sure the 88 in tank fuel pumps were low volume and the reservoir kept the high pressure pump from running out of fuel and also contained a check valve to keep fuel from draining away from the engine. The newer in tank pumps were high pressure and had a check valve built in. Their technical name is fuel delivery module.
Hello sir. I have an 87 f150 and decided to remove the front (smaller) tank due to rust and damage. The car was running great before I removed it (just had a large leak). I did not replace it and instead want to only run of the rear tank (I dont need both cause it is a ranch truck). What I did was I closed off the two fuel lines that went to that front tank with some extra fuel line hose, a screw, and a how clamp. When I started to just try running off the rear tank I had bad performance issues and the car would start acting weird and then shut off after 20 minutes of driving. Im thinking that maybe I need to change the fuel tank selector valve to something else. Do you know what could be causing my problems?
Because these selector valves are expensive, I would suggest joining a forum and asking the question there. Here's a link from a forum. www.supermotors.net/registry/2742/66025-2
There is an internal valve that is opened by fuel pressure. I think that's where that o ring goes. I'll try to find a link to a forum where it is discussed. I haven't gotten back to working on this valve.
www.ford-trucks.com/forums/1753958-would-a-faulty-tank-selector-valve-cause-the-eec-to-cut-power-to-the-fp-relay.html
Post number 8 at this thread has testing information on the selector valve.
photos.app.goo.gl/yjsqJ2ygm1jUY4EX9
The link is a screenshot from the forum, that describes the test procedure.
John, I'm the OP KarlJay. I'm trying to fix my selector valve. The two rods move freely, but the two valves on the other side have lost their O rings.
The 0.5 PSI anti siphon and the 20 PSI diverter valve. I'm trying to figure out how to get the O rings back in place. I can't tell if those valves come out from the body or not.
I didn't find your part 2, is there any way you can tell me how to get to those two valves on the other side and what that hole nearest the pickup tube is for. Mine is packed with something and I can't tell if it's supposed to be clear or not, your's looks like a clear thru hole.
@10:38 I can see a black O ring in the bottom, mine had a green one there and the black one coming out of the valve.
I've never seen those larger O rings successfully reinstalled.
This is the best information I've found on these valves. Keep scrolling down at this link www.supermotors.net/registry/2742/66025-2
I'm assuming that Ford never intended that part to be serviceable/rebuildable since plastic does not last forever; generally degrades and becomes brittle; especially soaked in gasoline which is why yours broke I'm sure. Better to just replace a part like that with a new one. BTW; the clip you are referring to as a "C-clip" is actually an "E-clip"; they both accomplish the same thing but E-clips are made to be removed with a flat screwdriver and, generally, C-clips require C-clip pliers. Thanks for breaking into that for us. I threw mine away as it no longer functioned. I also broke the plastic retaining clips that secured the fuel lines to that aparatus; luckily those are replaceable.
Pretty great teardown video. Thanks.
Hey Think if ever want to do more videos go for it you did great and thank you helped me out alot!!!!!
that compression piston with the spring part on it is what sticks....lubricate the snot out of it, reassemble and should be good as new. there's another video of a mechanic doing this. that plate that was attached to the orange diaphram was left on the 2 pins coming out of the top of it in his video.
John thanks for the video. I know you are a busy person so if you don't have time to answer it's ok, I do understand. I have a 1987 F-150 4x4 with the 351 4bbl HO engine from the factory and it actually has the mechanical fuel pump for both tanks. Every single video I have seen on these tank switches everyone has electric fuel pumps and nobody will even acknowledge my simple question, is the tank switch the same for the mechanical pump, or do you know, cause it is tough getting info on these things. Both my floats have drowned so I never really know how much fuel I actually have and my switch works now and then but not dependabley. My front tank builds up a frightening amount of pressure after running about a half hour, so much pressure that when I open the filler cap pressure comes rushing out loudly and with tremendous force. Back tank never does this. I have been a FoMoCo guy all my life but never had a tank switch issue till now. I am 60 years old and just got out of the wheelchair 3 years ago so crawling under stuff blind is a real chore. I don't mind fixing things when I know what to look for and I have the knowledge about most stuff but I don't move so well anymore. I live 21 miles off the pavement in very rural Arizona off grid and I can't walk very far anymore after getting hurt, that is why I am asking all this cause running out of fuel can be a real problem for me, that is why I bought the dual tank truck. Lol. Its always something i reckon and sorry this was so long but I had to ask. Thanks for your time and blessings.
@@randallbates9020 1987 F150s came from the factory with fuel injection. It's likely that someone put a 351 from a 1987 Ford F250, in your truck. The F250s with 351s were carbureted in 1987.
I don't know how they may have modified your truck.
My guess is, that they used the stock Dual Function Reservoir (aka fuel tank selector valve), and are using the mechanical fuel pump, to draw gasoline from the reservoir, in the bottom of the Dual Function Reservoir.
But that's just a guess.
I would suggest going to a forum like Ford Truck Enthusiast forum, and posting your question there. You'll get a bigger knowledge base there.
Maybe rig up a selfie stick and use the video function of your cell phone, to take a video of the fuel lines, in the area under the driver's seat, inside the frame rail, so you don't have to lay under the truck to see it.
If my guess is right, there should be a skid plate bolted over the Dual Function Reservoir, and 6 fuel lines going to it.
Happy New year love the video. Question so there is No filter in side the bottom of the valve selector. I have the same vehicle 1988 f150 5.0
No, there is no filter. I've seen information on an F150 forum that confirms there wasn't one on 1988s.
www.ford-trucks.com/forums/631465-fuel-tank-selector-valve-1988-f150.html
Thanks
Hoping you do part 2... I had the same small o-ring issue on the bowl side. it was pinched (half in half out) of the round passage with the spring loaded valve, again on the bottom (bowl side). Can't get figure out how to get reseated or if it even goes there or got sucked in??? Mine's an 1986, don't think the ones they sell work because the fuel line fittings are different.
Thanks,
Jon
Here's some good information. www.supermotors.net/registry/2742/66025-4
I've read somewhere that it needs to be reseated. The guy that put together that page at super motors is on a couple of F150 forums.
I have my selector valve torn apart right now. Were you able to pull the center piece out?
No, I couldn't get it apart.
For anyone having an issue with the O-rings in the bottom: plug all the holes and run about 100 psi of air and it blows it out and you can grab it and slide the O-ring back on. Only worked on the non return side for me. Hope this helps someone
Where do you blow the air in? I might try this with mine.
@@johnd.9145 So I plugged the fuel inlets for both tanks. Earplugs and electrical tape. Whatever works. And then there’s the outlet that goes to the engine. Plug that one too. And then there’s the two holes in the plastic body. Cover those with electrical tape. Then you gotta remove that valve for the fuel side and I cut up a heater hose and jammed it in and stuck the air hose in the other. Hope that helps. If not maybe I can make a video and put it on my channel.
If you made a video of that, it would be the only one I know of. Thanks for the info.
I made a quick little video. It’s on my channel.
Hey I have a 1986 and I am getting some leakage due to the same thing I’m sure , I have a 1986 f150 these reservoirs seem to be identical what’s your thoughts on that? I haven’t found any videos that show this issue related to a 1986.
Where can I find this fuel filter housing, I didn’t find it online or in any stores
I would try places like Rock Auto, Jeff's Bronco Graveyard and LMC Truck and Amazon.
I had the same problem with selector valve leakage on my 87 F150. After looking at the mess ford made of the fuel system, looking at the cost of new parts, I put in 3/8 stainless lines to a real brass 3 way valve. That ford selector valve was designed by an idiot (on LSD). No more fuel system troubles. BONUS Turn the valve to the 3rd unused position and if someone tries to steal it, there is only the gas in the float bowls.
Is there a filter in it
@@davidparks538 There wasn't a filter in my '88.
@@davidparks538 This link has really good information. www.supermotors.net/registry/2742/66025-2
According to the link, the filter was moved to between the in line fuel pump and the engine, in '86. So after '86, there should only be the external fuel filter
Did you ever create a part 2?
Nope. Haven't had time.
Is there any electrical connections going to it my truck had one but the guy took it off , and I can’t find any electrical connectors
no, the piston is actuated by the pressure of fuel flowing through the valves
Hi I have a 88 ranger, can I bypass this all together and put two pieces of fuel hose
I'm sure there's a way to bypass this valve, but I don't know the details of how to do it. If you have two fuel tanks, you'll need some way to switch between them.
@@johnd.9145 one tank, two line back and two in front
www.therangerstation.com/forums/index.php?threads/fuel-lines-and-deleting-canister.155507/
It sounds to me like people have successfully deleted the reservoir by adding a later model in tank fuel pump. I'm pretty sure the 88 in tank fuel pumps were low volume and the reservoir kept the high pressure pump from running out of fuel and also contained a check valve to keep fuel from draining away from the engine. The newer in tank pumps were high pressure and had a check valve built in. Their technical name is fuel delivery module.
Hello sir. I have an 87 f150 and decided to remove the front (smaller) tank due to rust and damage. The car was running great before I removed it (just had a large leak). I did not replace it and instead want to only run of the rear tank (I dont need both cause it is a ranch truck). What I did was I closed off the two fuel lines that went to that front tank with some extra fuel line hose, a screw, and a how clamp. When I started to just try running off the rear tank I had bad performance issues and the car would start acting weird and then shut off after 20 minutes of driving. Im thinking that maybe I need to change the fuel tank selector valve to something else. Do you know what could be causing my problems?
Because these selector valves are expensive, I would suggest joining a forum and asking the question there. Here's a link from a forum. www.supermotors.net/registry/2742/66025-2
Use penetrating oil, wd-40 is not a penetrating oil.
What does that little black O-ring go to in the bottom of the fuel selector valve that is shown in thumb nail?
I had the same thing in the bottom of nine and for the life of me I can’t find where it came from
There is an internal valve that is opened by fuel pressure. I think that's where that o ring goes. I'll try to find a link to a forum where it is discussed. I haven't gotten back to working on this valve.
www.ford-trucks.com/forums/631465-fuel-tank-selector-valve-1988-f150.html
Where Is the part 2?
Good question. I haven't gotten back to working on it.
@@johnd.9145 lmao
man I hope you ain't gotta put that back in your truck