thank you for the quick reply, do you happen to know the actual part number for the transfer valve? (1988 F250 7.3L Diesel)? When I called for the part shop they asked if I knew the part number and I can't read the complete number on the one on my truck.

Thank you again!

 

Part Number should be:
6C3Z-9189-A




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We have a 87 f150 efi. We don't use the truck often. Now we a fuel problem. It's like she runs out of fuel and when I wait a while she will start run again smoothly for 5 to 8 km just die under my foot again. I have replaced both tank pumps and have taken the fuel tank selector valve of and opened the bottom canister. There is two valves visible. One has a green o-ring on and sits flush with the casing. The other is inside its cylinder and has no o-ring. Question. Is this how it's supposed to be or is the retracted valve faulty.?

 

It's been a while since I did mine...I never opened it up as it's pretty cheap from the parts house to replace with a universal one which is what I did. Not that it will help much now that yours is apart, but you can hear the valve switch when the voltage is applied to either side. IIRC the tank select switch is what puts the 12v through the appropriate side of the valve. You can find a schematic by searching, maybe this thread? but I know there are some on the board here somewhere that pins out the wiring. You could probably test it for operation.

 

Hi All!

I have a newly purchased 1986 F250 4x4 manual 351W 4Barrel, mechanical fuel pump.

Discovered a fuel problem today. I've only had the truck for about a month with about 150 miles put on her. I was running on what I thought was the rear tank according to the dash switch location,, ran it down to 1/4 tank and went to the gas station. Tried to put fuel in it and the rear tank was full? So I went to put fuel in the front tank which took the appropriate amount of fuel...

Do I have a bad switch on the dash or the famous selector valve? Is there a reliable aftermarket valve out there?

Thanks!

 

Fred,

It sounds like the selector valve is stuck on the front tank.
The default position (no electrical power to it) of the valve is the rear tank.
The fuel lines may be switched at the valve and the wires to it may be bad also or disconnected.
The selector switch on the dash just selects the fuel gauge sender and turns power off and on to the valve.

It should be wired like this but the wire colors may be different:


The selector valve will look something like this:
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Sorry to resurrect a dead thread, but I'm on the home stretch fixing up my new-to-me f-150 and I'm still stuck sorting out my fuel issue.

1986 f-150, carbureted 4.9, 4x2, long bed

No tank selector valve present on the frame, PO installed an inline filter in its place. Fuel gauge does not work--stuck dead on E. Tank selector switch in cab is set to rear tank, though I'm pulling from the front tank at all times. I've never flipped the switch in the cab for fear of what's in the alternate tank--without a selector valve I'm relatively sure that nothing would happen anyway.

I'd like to get my fuel gauge back and I'm open to any and all suggestions.

Thanks for your help.

 

86'F-150,

If he has it piped only running on one tank then switching the switch will only select the fuel gauge to a tank.



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Im working on an 87 f250 460 carb. and it has the 6 port w/o resivior the # is E7TB-9F271-AA, it has the quick connects and low pressure pumps, no frame pump
Ford told me the replacement is 6C3Z-9189A,does this sound right? Thanks so much

 

Should work.

 

After reading this entire post. I think I may have my problem narrowed down to the dual function reservoir but wanted to see what you guys think. 89 f250 460 4x4 the truck runs perfect when the rear tank is selected and the gauge reads correctly but when switched to the front tank the pump starts to whine and the truck dies but the gauge reads correctly. I naturally thought the in tank pump was bad so i replaced it. same problem.. I can hear the pump turn on inside the tank with KOEF so I dont think it is electrical also I checked the in dash switch and I get power on the red wire front tank and power on the brown/white wire rear tank so I think the switch is good. I don't have the cross flow problem that many others have had but my question is this: If the dfr selector is bad could the diaphram or valves be stuck creating my problem? At this point I'm not sure what else it could be. Any thoughts?

Thanks

 

The fuel tank selector valve could be stuck on the rear tank.
The gauge and the pump are two separate system. One system will work OK without the other.

 

6C3Z-9189-A (replaced E7TZ-9189-A [marked E7TB-9F271-AA] and E9TZ-9189-A [marked E9TB-9F271-AA] .. Fuel Tank Selector Valve Assy.

 

thanks for that info Number, Very helpful, I think I got her fixed
I appreciate your time, and sharing the info you have

 

Hi Gang,
This sure is a long running thread, but I quess that's due to the many problems with these reservior selectors.
I have a 89 F-250 six cyl and it has been sitting for over a year; I pulled the pick-up bed off for conversion to flatbed and so a great time to work on the tank system. I found both pumps and both senders bad and the hi-pressure pump also frozen up. I am not complaining you understand as I bought this truck new and have never had any fuel system problems, all still original parts. What I plan to do is convert to one tank (rear) and I was looking for advice on should I put in a single tank reservior or just connect it straight. I will be replacing the in tank pump and the hi-press pump.
Thanks and I must say I appreciate what you all do here, keep up the good work.
Dan