Fuel tank problem

Reply Subscribe

Thread Tools

Search this Thread

Dec 18, 2015 | 08:22 PM

njjr

Thread Starter

Freshman User

Joined: Apr 2014

Posts: 37

Likes: 0

From: Rosedale, Md

Fuel tank problem

Have a 1989 F150, 4wd, 6 cylinder Pick UP. I recently installed a front fuel tank with pump and sending unit.

Took a ride and noticed unusual fuel consumption. Scratched my head and did a lot of checking. Kept refilling the front tank.

Today I came home and noticed that there was gas leaking from the fuel inlet of the rear tank which I was not using. Fuel gage of rear tank reads empty so that is a problem needing fixing later.

Why is the fuel being transferred to the rear tank? Other than the gage sending unit, there is nothing wrong with the rear tank that I know of.

Dec 18, 2015 | 08:39 PM

chrismd188

Senior User

Joined: Jan 2014

Posts: 186

Likes: 0

From: Indiana

sounds like a bad fuel delivery module

Dec 18, 2015 | 09:02 PM

rla2005

Fleet Owner

Joined: Oct 2005

Posts: 20,784

Likes: 1,751

From: Kentucky

1989 truck has a dual function reservoir instead of individual high pressure in tank pumps with the associated valves inside the tank.

Fuel transfer is caused by a defective DFR.

Dec 19, 2015 | 06:27 AM

njjr

Thread Starter

Freshman User

Joined: Apr 2014

Posts: 37

Likes: 0

From: Rosedale, Md

My 1989 Ford truck has fuel pumps inside the tank and one on the drivers side of the frame.

Dec 19, 2015 | 06:38 AM

rla2005

Fleet Owner

Joined: Oct 2005

Posts: 20,784

Likes: 1,751

From: Kentucky

Quote:

Originally Posted by njjr

My 1989 Ford truck has fuel pumps inside the tank and one on the drivers side of the frame.

Exactly. ....and a dual function reservoir that controls fuel flow. That's why I am saying the issue is not a bad Fuel Delivery Module (FDM) inside the tank. If your truck was a 1990 and later then I would agree that would be the cause (bad FDM).