Hi,

This morning I noticed that my gas guages were reading wrong. I had run the rear 18 gallon tank down to near empty and switched over to the front tank. I had a little more than 3/4 full in the front. When I started the truck this morning, the front tank read 1/4 full and the rear read just over 1/2 full. When I went to fill up the rear tank today, it only took 9 gallons while the front took 14. I had driven about 20 miles on the front tank since i last filled it.

Since I filled up, I have noticed that gas is constantly dripping out of the filler for the rear tank. I have been running off the front tank, and I can continuously watch the needle fall.

Any suggestions appreciated, I have a feeling this is the last straw and the truck's going to get traded in.
Thanks

 

there is another post on the forum that says the same thing....they put gas in the front tank and it ends up in the rear tank....I wonder how that can happen....maybe a siphon in the return line or something? I'm clueless

 

yep.....definitely can......tank solenoid or switch goes bad.......there is a recall about it up at the top......and others here can tell you more......I just know it can do it,
Don't trade it.....fix it........heheheh

 

Thanks for the reply.

The truck has taken in almost $1000 to just keep it running in the last 9 months, for a truck only worth $3k.... doesn't seem worth it- especially with the worrying if it is going to run and not strand you.

 

On a '93, the fix is a check valve on each pressure line from the pump. It used to be under extended recall, but that's expired. If that doesn't fix the problem, then one or both pumps need to be replaced. Either way, the easiest way to do it is to pull the bed and work from the top. You'll have to talk to a stealership for the part number on the check valves.

Jason

 

This happened on a 92 I used to have, it would overflow out the cap of the rear tank if I wasn't careful. I replaced the front tank pump module and that fixed the problem.

 

Both of my Ford work trucks did this, the front pump module will fix the problem.

 

If it's filling the rear tank, it should be the rear fuel delivery module that is bad, allowing that fuel to enter the tank when it is not supposed to.

 

I had my 93 F150 do that exact same thing and I ended up at the dealership where they had to replace both fuel pumps and solenoids the replace the front and said that fixed it but it did the same thing on the way home so they had to replace the rear as well

 

Which probably means there was nothing wrong with the front one....

 

They actually were both bad the solenoid/check valve and the fuel pump is a unit the the check valve in the rear was bad and the solenoid was bad it the front I believe, it has been 3 or 4 years ago now right after the warenty was over lol go figure!!

 

There are no solenoids in either tank or in the fuel system.

EPNCSU2006 is right on track above, listen to him.

 

hey I wasn't saying anyone was wrong or anything I was simply telling you what happened to my and my 93 F150 I can look for the paperwork and post a copy of it if you like. I am not trying to step on anyones toes geee. I never intended to sound as if I was saying EPNCSU2006 was incorrect or anything else along that line but please don't treat me as though I am trying to mislead anyone that is what happened to me with my 93 maybe Ford got over on me for one fuel pump then but I know that I had to have both replaced to get the whole problem fixed.

 

I was not trying to treat you in anyway or attack you personally if you were referring to my post above.
There are a lot of browsers that come to this site for information that you do not even see let alone the first timers on here. When I see something that is wrong on here I try to correct it so the wrong information does not go out, that is all.

The above problem happens to the non-running tank that has a bad check or shuttle valve. At one time the 1993 trucks came from the factory with a bad fuel pressure regulator that let the pressure go to high and it would blow out the check valve in the non-selected fuel delivery module. When the driver switched to the other tank it would blow the other one too.
Fords answer was to replace the fuel pressure regulator and put outside check valves on the two pressure lines leaving the tanks so they would not have to replace the fuel delivery module as they should have. It did save them a lot of money.
No other year was effected by this recall but for some reason a lot of these check valves did get put on other year trucks when their valves went out. Some were put on trucks that had other fuel systems and made them run poorly like the 1989 F series and the 1990 E series.

Somebody is going to say they saw a safety bulletin from a safety group on other years for this problem. I have never seen any place that Ford said it effected any other year as the safety groups have said.

Under normal use the check and shuttle valves can go out and cause this to happen also and as EPNCSU2006 said you just replace the fuel delivery module as you do not know if it is the check or the shuttle valve doing it.

The only solenoid ever used in a Ford trucks gasoline fuel system from 1997 back was a solenoid fuel selector valve used from about 1985 back into the 70s.

Here are some diagrams of this fuel system.

Wiring:
http://i54.photobucket.com/albums/g91/subford/Fuel/Fuel-sel1993.gif

Fuel Delivery Module:
http://i54.photobucket.com/albums/g91/subford/Fuel/FuelDeliveryAssembly2.gif

Fuel Pressure Regulator:
http://i54.photobucket.com/albums/g91/subford/Fuel/fpr02.gif

Fuel Lines:
http://i54.photobucket.com/albums/g91/subford/Fuel/FielSystem.jpg

8 cyl Manifold:
http://i54.photobucket.com/albums/g91/subford/Fuel/Fuelmanifold.jpg

6 cyl Manifold:
http://i54.photobucket.com/albums/g91/subford/Fuel/FuelManifold4.gif

 

............What pissed me off is that I HAD a recall done on the fuel regulator. It said that it could allow too much pressure, and cause the check valves in the fuel pump modules to go bad. Well, IT DID. Shouldn't they have replaced them too? No, according to them. I went with an aftermarket module, much cheaper, and it finally solved my problem.
Oh, and they put a big scratch on my front fender while they had it!