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When switch to front tank truck stalls. why - F-150 Ford Cars & Trucks

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Bad fuel pump. I've had dual tank pumps down more times than I care to count on F-Series trucks. Every time I've looked for ANYTHING else it could be besides a pump, and of COURSE, everyone's solution initialy is "Hmmmm, let me FILL UP THE TANK first". So yes, I have to drop a FULL fuel tank, change the pump, and loose 4 gallons on my shop floor. Repeat once a week for 15 years. And in 15 years, I've never NOT had a "hey, this thing stalls when I hit "X" fuel position" be anything less than the worst case situation... A full tank and a bad pump. the Stick

Posted on Dec 10, 2009

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Posted on Jan 02, 2017

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1 Answer

I have a 2000 gmc 3500hd,the fuel gauge stopped at half way and i run out of fuel. the rear tank is not sending fuel to the front tank?


David Johnson is wrong about that. The Chevy HD dual tank has two sending units, one in each tank , one fuel pump, a fuel pump relay switch and a equalizing pump. If the truck stalls out at 1/2 tank, it is the equalizing pump. That pump, pumps fuel from the rear tank to the front. If the pump is out, the front tank empties, the truck shuts down, the guage reads half tank because the back tank is still full, but the equalizing pump won't pump the rear fuel tank load to the front. Hence the problem you listed above, not a sending unit.

Dec 15, 2011 | Cars & Trucks

1 Answer

My aux tank valve will not change from front to back, fuses are good , switch works good . engine stalls when I move dash switch from rear tank to front. but if I flip back real quick, it gets fuel and is...


Check your fuel pump in the front tank. The fact that it begins to stall - tells me that the valve is actually working - the front fuel pump just isn't pump fuel.

May 26, 2011 | Ford F-250 Cars & Trucks

1 Answer

No fuel guage readings,cant use front fuel tank vehicle stalls out,fuel coming out of front fuel tank cap when running,1988 ford e150


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.

Jan 14, 2011 | 1988 Ford Econoline

1 Answer

Can't use front tank. i fill the rear tank, front tank eventually fills up. switch to front tank, it'll run for about 5 minutes then stall. then i switch to rear...fine. why is the front tank filling up...


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.

Sep 12, 2010 | 1989 Ford Econoline

2 Answers

Front fuel tank not working properly


Your truck has a mechanical switch that may not be working. Check it for power and ground.

One of the problems with 2 tanks is a lot of folks only run off of one and then you can get a sludge build up and could have a plugged pick up line.
Try this remove the fuel cap for the front tank.
Disconnect the front tank fuel line from the switch valve.
If you are not getting a good flow of fuel using low pressure air no more than 25 to 40 PSI blow back into the tank.
Now do you have fuel flow?
Your switch valve may be plugged on the front tank side - If you are getting fuel to the switch valve and not through it I would replace the valve.
You may also have a bad dash switch
Hope this helps Please leave a testimonial if it does
Thanks
Scott

Mar 11, 2010 | 1982 Ford F 250

1 Answer

85 E-350 fuel problem


there is a switching valve under the vehicle that switches from front to rear. it may have gone bad or the switch itself may be bad

Oct 03, 2009 | 1985 Ford Econoline

1 Answer

Rear tank full and selected for use but draws from the front


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?

Nov 20, 2008 | 1989 Ford F 250

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