Hello, Bought a 92 ford f150 longbed with a 4.9 for 1500 bucks and needless to say i got ripped off. Anyways my dad and I dropped both tanks to replace them with MTS aftermarket tanks and a new fuel pump just for the side tank. The rear tank had gotten a new fuel pump before i bought it and when pulled out it looked very similar to the new pump we were putting in (had the spliced wires). Bottom line this truck got a brand new fuel system.

When i drove it several days ago with the rear tank selected i got fuel leak from the top of the fuel filler hose of the mid tank. After, I drove to my house with the mid tank selected to lower the fuel amount and with both fuel caps barely screwed on because i thought it was a vacuum issue( I got hissing when taking the cap off). When i drove it again that same day with the fuel caps on tight and rear tank selected i got the same problem except fuel was now coming out the top of the rear tank (it was very swollen) and to release the pressure/fuel i took off the gas cap and 3/4 of a gallon came out the top of the neck. I drove home about 10 miles with vented caps and didnt have any problems.

So is this a 92 Ford recall Problem? or a ventilation problem? If i have brand new pumps would they have the necessary check valves that remedied the 92 ford recall? MTS was not aware of any check valve but i dont think they are the ones who manufactured the pumps. Thanks for any insight.

 

It might be the tank cross over valve pumping fuel into the rear tank, there are threads here some where that deals with the valve, I heard some trucks had problems with them, so therefore pumping fuel from the mid tank to the rear tank thus over filling it.

 

A guy at work has a 89 F-150 and I was talkin to him about it and he asked if when I switched tanks if it pumped fuel from the rear to front like his did. I hadn't heard of that before!

 

I've seen a '91 with a bad tank selector valve that would do that. It drew fuel from one tank but returned it to the other. Noticed the gas gauge dropping quickly while driving?

 

yea the fuel seems to drop pretty fast. I always figured the truck got bad gas mileage. How fast we talking?

If i have a brand new pump in my rear tank with that check valve, how can fuel manage to transfer into it from my mid tank? and vice versa.

Is the 92 4.9L a late generation FDM?

Is the cross over valve also called the shutter valve? Is it part of the Fuel pump assembly? If I think this is what you are talking about, it shouldn't be a concern if i have new pumps.

Does my 92 have a tank selector valve? i know the 91 is a different generation.

Could the problem be the fuel pressure regulator?

 

Hey, these things break...it could happen on a $1500 truck or a $3500 truck. I don't know what other issues the truck has, but it still may have been an ok deal! I don't think anyone here can say that they paid $1500 on a truck that didn't need a little work. It can be frustrating having problems on a recently purchased vehicle, but by taking a little extra time to understand your problems before throwing money at them and using your own labor will make it a good deal. Its a great learning experience that will help you make good decisions about your vehicles down the road. Personally, I'd rather spend $1500 on a vehicle that needs $500 worth of work, than $2000 on a vehicle that seems to run well. I can make that $500 stretch a lot farther and will have the confidence that my work will last.

Good luck and keep your chin up! Welcome to the forum!