Hello There
I have a 1996 f-250 4.9 6 cyl. automatic with overdrive.I also have the aux gas tank.When i switch to the main front tank the truck dies.if i use the rear tank it runs fine.the switch still shows the amount of gas in each tank but thats it.Any ideas as what to do would be a big help

thanks
Jim

 

possibly a bad front fuel pump?? when you turn the key to on have someone listen to the front tank to make sure the fuel pump whines for a couple seconds

 

Thanks alot for the best advice i got so far.No one ever thought of just listening to hear the pump in the tank.I hope it works so i do not have to drop the tank,As of now the truck is in the shop getting a new transmission.A broken band caused it to give up the ghost.as soon as i get it back thats the first thing i will do.

by the way i checked out your truck.It is one of the nicest trucks i have .seen.It looks like it means bussiness and not just gaudie looking or a beat up junker.it looks like you have the right combination of looks and guts.

 

Sometimes, if you dont hear the pump kick in, you can get under there and beat on the tank while someone turns the key on and off, and the pump will start working. But, this is usually temporary if it does work at all. It may save you a towing bill. That is the good thing about dual tanks,... you have a backup.

 

Ok I hope to revive a old topic My switch just stopped working, the gage do change nothing happens at all this is out of the blue its been fine I switch back a forth at least three times a month...Any ideas beyond the fuse?

 

And sorry I forgot this is a 96 F250 as well 460 4X4 auto

 

What does it do? Die? Keeps running?

 

Ill check today to see if it dies out the gage don't move at all so I assumed it didn't switch

 

Ok when I switch it over and leave it the engine starves for gas and dies.

 

Sounds like the tank you are switching to has a bad fuel pump in the tank.

The gauge is a separate system and has nothing to do with the running of the pump in either tank.
They do share a common ground and a common switch in the dash and that is it. The sender information does also travel in the same wiring harness and plugs but is electrically separate.

 

Ok I know for a fact that the tank I can't switch to is full but the gage don't move at all, do you still think its a bad pump and not a electrical issue?

 

Still sounds like a bad pump to me. And being that your truck is a '96, a bad fuel pump is an electrical issue. If you can't justify a new FDM right now, a siphon pump will help save the fuel in the dead tank.

 

The fuel pump and fuel level sender are two completely different circuits so yes it's possible to have only one of them working.

 

Ok the whole pump and assemble is 95$ from Rock Auto any one have experience with them?

 

Which one? I have the Airtex FDM in the front tank of my truck and it seems to be doing fine.

I say "seems to" because I have slightly low pressure at the rail but I think that's due to my rear FDM leaking and bleeding pressure off, rather than a problem with the Airtex setup.