Fuel is filling front tank from rear on 89 ford e150
When engine is running and the rear tank is in use, fuel runs to the front tank. I bought a diverter valve from auto parts store. can't find where it goes. in front of the front fuel tank is a part with 2 fuel lines from the engine and 4 lines to the tanks. it has no electrical wires running to it. it is the only thing like that i can find on the frame.
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Re: fuel is filling front tank from rear on 89 ford e150
Fords had this problem. I believe they actually had a recall notice about this problem. You have a fuel tank switch on the dash somewhere. This is where your problem is located. The switch has gone bad that switches from front tank to the rear tank. About $40.00 for the part.
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Check tanks for balance tube between tanks If the air pressure is not allowed to equalise between tanks then the vacuum formed will not allow fuel to flow to the pump. Breathers on both tanks are a start.
im thinking that this has dual tanks and one of the selonoids that switch the tanks have failed, Its the fuel coming out the cap that is tough. does it flow out the cap like its over full or is it just a couple splash drops like rain drop? does the other fuel tank read the same fill level while this is happening?? Cause the only way the front fuel tank can get full is if the fuel is being pumped into it by means of the fuel in the other tank. Now im not sure if they run return lines on that but if they did and the return line is near the cap i could understand the couple splash drops. Vehicle stalls on the front tank because the selonoid that opens and closes allowing fuel to be picked up to the motor is bad or the electrical switch or wiring is bad. selonoids are located under van close to the front of tank.
I have had the exact problem on my ford truck, and fixed it. There is a tank feed shuttle valve mounted to the drivers side frame rail that is the most likely suspect. It operates by fuel pressure and when it fails, it fails so the front tank doesnt work.
It is worth mentioning that there are three fuel pumps on your truck, each fuel tank has a small low pressure pump inside the tank, and there is a high pressure pump located on the drivers side frame rail too, just before the fuel filter.
The front in the tank pump could be bad, too, but most likely the shuttle valve is the problem.
Ok sounds like a electrical problem being an 89 its fuel injected eather 5.0 or 5.8 each tank has its own fuel pump and sending unit a dashboard switch, relay, fuse and switching motor. check your fuel line from the front tank it could be clogged. check for 12v pwr. to the front pump the sending unit will require 4V but not much. as soon as the fuel rail pressureizes the ECM shuts the pump off using the relay. Usually the tank switch goes bad first.
Does you truck restart after dying and then run ok or does it stay dead until switching back to the rear tank?
It could be that the front tank has a leak in the suction line which will leak when not in use and **** air when you switch to it.
A suction air leak could be the reason for it dying when switching tanks
There is no selector valve on a 1995 ford f150 300 engine. The selector switch on the dash sends power to the pump in the selected tank. The pump then sends fuel to the engine. If engine won't run on the selected switch, the pump in that tank needs replaced.
hi your symptoms suggest that you have slight blockage either in fuel line or most likely at point where rear tank fuel line enters the switch over reason ? you say runs ok on rear tank at 55mph? but when demand for more fuel / speed above that pump /engine cannot deliver ? due to narrowing of fuel line (tuberculation) so check flow from r/tank and for any debri inside?