fuel tank problem
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fuel tank problem
Hello! This is my 1st time on this site. I need some information and help. I have a 1988 F150 with a 5L engine. I have just replaced both fuel tanks and installed new pumps in each tank. When I use the front tank I have no problems but when I switch to the rear tank my front tank fills with gas and pours out the filler tube. Thanks
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If you get a minute check out the link here, it will help you to navigate around and understand this site.
https://www.ford-trucks.com/forums/s...88#post3272088
We are happy you have chosen the best source for Fords!
Enjoy FTE and The State Chapters are located at the bottom of the main forum page.
JOIN CLUB FTE -SUPPORT THE FORUMS!
See you on the boards.
….
Senior User
Joined: Feb 2005
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From: Pittstown NJ
Well I have heard of this problem there is a defect in a check valve in the tank switching system which allows fuel to be pumped from one tank to the other but I dont know any of the specifics Im sure one of the other people in the forum will be able to help you more good luck
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Joined: Aug 2005
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From: Easton,Ks
Originally Posted by gkl273
Hello! This is my 1st time on this site. I need some information and help. I have a 1988 F150 with a 5L engine. I have just replaced both fuel tanks and installed new pumps in each tank. When I use the front tank I have no problems but when I switch to the rear tank my front tank fills with gas and pours out the filler tube. Thanks
Here is a diagram of the valve but I understand that the new replacements do not have a filter in them now.
Last edited by subford; Jan 13, 2006 at 05:48 PM.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Originally Posted by gkl273
I just want to say thanks. I did see this valve in the chiltons book but there was no information about it. Thanks again.
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Joined: Dec 2005
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From: Near Waterbury, CT
I have an F-250 of the same year & dual tanked. If I recall, it's all electric in the switching. I have the same problem except that I know about this problem and I usually don't run the rear tank unless I know my front tank has some room. Anyway, back to the point, I think I recall reading in me Haynes' manual that the routing of the fuel lines causes some of the rear tank's fuel to return to the front tank. But this is mere fuzzy speculation.
The '88's have low pressure electric fuel pumps in each tank so it's just a matter of switching which one is on. I replaced both my tanks at the same time and replaced the pumps as well, I'm certain of this one. I don't know any fix (It's low on my list of priorities), but I just wanted to make you aware that this other direction of thought.
best regards! -Jim
The '88's have low pressure electric fuel pumps in each tank so it's just a matter of switching which one is on. I replaced both my tanks at the same time and replaced the pumps as well, I'm certain of this one. I don't know any fix (It's low on my list of priorities), but I just wanted to make you aware that this other direction of thought.
best regards! -Jim
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From: Easton,Ks
Originally Posted by JimCT
I have an F-250 of the same year & dual tanked. If I recall, it's all electric in the switching. I have the same problem except that I know about this problem and I usually don't run the rear tank unless I know my front tank has some room. Anyway, back to the point, I think I recall reading in me Haynes' manual that the routing of the fuel lines causes some of the rear tank's fuel to return to the front tank. But this is mere fuzzy speculation.
The '88's have low pressure electric fuel pumps in each tank so it's just a matter of switching which one is on. I replaced both my tanks at the same time and replaced the pumps as well, I'm certain of this one. I don't know any fix (It's low on my list of priorities), but I just wanted to make you aware that this other direction of thought.
best regards! -Jim
The '88's have low pressure electric fuel pumps in each tank so it's just a matter of switching which one is on. I replaced both my tanks at the same time and replaced the pumps as well, I'm certain of this one. I don't know any fix (It's low on my list of priorities), but I just wanted to make you aware that this other direction of thought.
best regards! -Jim
Yes the 1988 do have two in-tank pumps (one in each) and one on the Frame Rail.
Newer Trucks (1991? on) do not use the Mechanical Valve and went to check valves in the Tanks.
So from what I can gather:
19?? – 19?? = Hand Valve
19?? - 1985 = Electric switching
1986 - 1990 = Mechanical switching
1991 - To date = Check Valves in Tanks.
If any body knows for sure that any of the dates are wrong or can fill in any dates please do so.
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