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Fuel problems


Randy Lambert's Avatar
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12-26-02, 03:15 PM   #1  
Fuel problems

1990 Ford f-150, 4.9L engine, Dual fuel tanks(metal). One of the fuel tanks doesn't work. When the foreward tank is selected, the engine quits after the fuel is burned out of the line. What else besides the internal tank pump could be bad? Could the selector valve be bad? Is there any way to change that pump without dropping the tank? It looks like both tanks go through the same fuel filter. Is this true? Any help would be appreciated.

Thanks,

Mr. Too cheap to go to the dealer for help.

 
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Joe_F's Avatar
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12-26-02, 04:21 PM   #2  
Joe_F
The tank must be dropped or the bed removed to access the pumps.

Yes, the selector valve could be bad and not switching the pump on.

 
Randy Lambert's Avatar
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12-28-02, 02:49 PM   #3  
Fuel Tank pump

The fuel pump in the aux tank seems to work at idle but when you accelerate, the engine starts to cut out. There is only one fuel fliter for both tanks. Would a bad pump work at Idle and not at higher rpms? Any other suggestions would be appreciated.

Thanks

 
bejay's Avatar
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12-28-02, 04:08 PM   #4  
yes a bad pump could supply the engine with enough fuel to idle but not enough for it to accelerate, both do use the same fuel filter on the frame rail.

 
Stevo2's Avatar
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12-28-02, 11:37 PM   #5  
Can you switch tank hoses at the selector valve and see if the problem follows?

 
Randy Lambert's Avatar
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12-29-02, 02:41 PM   #6  
fuel pump problem

stevo 2 :

The transfer switch is an electric switch on the dash. It turns on the main pump or the aux pump. It's not a manual selector value for the fuel lines. The fuel lines are "T'd" together back about mid bed, before going through the fuel filter. Which ever pump is on provides fuel to the engine. Sounds like my problem is a clogged line just outside the tank or a weak pump. With a full tank of fuel, dropping the tank won't be fun. Any more Idea's would be appreciated.

Thanks

 
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12-29-02, 02:58 PM   #7  
Joe_F
You can use an electric pump with a hose to pump out the fuel into an approved container or another vehicle. Be VERY careful about making sparks!!!!

 
darrell McCoy's Avatar
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12-29-02, 03:13 PM   #8  
darrell McCoy
I have used an external type 12 volt A/C fuel pump to remove gas in tank.
Does not take all that long. Like Joe say's tho. "No Sparks"

 
Stevo2's Avatar
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12-29-02, 07:21 PM   #9  
Forgot yours was fuel injected on my old ride the two tanks go to one electric selector valve and its easy to bypass. Well it looks like you have narrowed down the problem and I'm almost sure that the pump is weak. Some options..there's no drainplug? You could try to rent a fuel transfer pump or how about just disconnecting the fuel lines for that tank from where they are T'd and then activating the intank pump from the fuel pump relay in the front of the truck? Fumes-no sparks. It should only take a few minutes to pump it out. Make sure you get a name brand replacement pump and strainer or you'll be back doing that again real soon. Some of the aftermarket pumps are just trash. Some good ones....AC Delco, Motorcraft, Borg Warner,etc.

 
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