Gas jumps tanks?
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Freshman User
Joined: Apr 2006
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Gas jumps tanks?
89 f250 efi. I fill the rear tank up and half the gas moves to the front... How?
What is that part called on the driver side that the four fuel lines join into to and then head to the pump. it has a bowl on the bottom that says donot open.. and like an idiot i did because it was leaking.. i stop it from leaking.. but not sure why the gas is moving around so much.. it will move about 3 gallons or more in an hour
What is that part called on the driver side that the four fuel lines join into to and then head to the pump. it has a bowl on the bottom that says donot open.. and like an idiot i did because it was leaking.. i stop it from leaking.. but not sure why the gas is moving around so much.. it will move about 3 gallons or more in an hour
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Joined: Jul 2005
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From: Norman, OK
That thing is called a dual function reservoir (DFR). If it's bad, it will cost you about $80 at Ford. The DFR is a place for fuel to sit to prevent disruptions during tank changes, since there is always fuel in this little cup for the engine to draw from. At one time, those things had replacable filters in them. The newer ones do not hava a filter, just a rubber O-ring which is a bear to replace if you unscrew the cap that says "do not open." This topic has been addressed a lot on this forum and you have either a bad in-tank pump (the rear one, I believe) or the DFR is bad. Check out some of the previous posts to get an in-depth explanation for this problem. Good luck and keep us posted.
Last edited by mike2112; Aug 8, 2006 at 08:17 PM. Reason: typo
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Joined: Feb 2005
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From: Biloxi MS
If your '89 is similar to my '90 then you have a bad FDM - Fuel Delivery Module
There's a fuel pump in each tank which also contains a valve which closes off the return line to the tank not being used and ensures that all the fuel coming back in the return line goes back into the tank it came out of. When that fails, the tank you're not using will accept some of that returning fuel, and it will eventually fill the tank not being used, unless you switch to that tank and use it before it overfills
Don
There's a fuel pump in each tank which also contains a valve which closes off the return line to the tank not being used and ensures that all the fuel coming back in the return line goes back into the tank it came out of. When that fails, the tank you're not using will accept some of that returning fuel, and it will eventually fill the tank not being used, unless you switch to that tank and use it before it overfills
Don
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Originally Posted by alphacarina
If your '89 is similar to my '90 then you have a bad FDM - Fuel Delivery Module
There's a fuel pump in each tank which also contains a valve which closes off the return line to the tank not being used and ensures that all the fuel coming back in the return line goes back into the tank it came out of. When that fails, the tank you're not using will accept some of that returning fuel, and it will eventually fill the tank not being used, unless you switch to that tank and use it before it overfills
Don
There's a fuel pump in each tank which also contains a valve which closes off the return line to the tank not being used and ensures that all the fuel coming back in the return line goes back into the tank it came out of. When that fails, the tank you're not using will accept some of that returning fuel, and it will eventually fill the tank not being used, unless you switch to that tank and use it before it overfills
Don
mike2112 is right on this one all the way.
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Fuel Tank
OK i have a 1988 ford f350 D 7.4 liter, The main tank wont Take fuel. Its empty just spits fuel back out. what can i do. the rear Tank takes fuel but its the smaller Tank.
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Junior User
Joined: Oct 2006
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Originally Posted by alphacarina
If your '89 is similar to my '90 then you have a bad FDM - Fuel Delivery Module
There's a fuel pump in each tank which also contains a valve which closes off the return line to the tank not being used and ensures that all the fuel coming back in the return line goes back into the tank it came out of. When that fails, the tank you're not using will accept some of that returning fuel, and it will eventually fill the tank not being used, unless you switch to that tank and use it before it overfills
Don
There's a fuel pump in each tank which also contains a valve which closes off the return line to the tank not being used and ensures that all the fuel coming back in the return line goes back into the tank it came out of. When that fails, the tank you're not using will accept some of that returning fuel, and it will eventually fill the tank not being used, unless you switch to that tank and use it before it overfills
Don
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