Dual tanks
Thread Starter
|
2nd Gear
Joined: Mar 2023
Posts: 2
Likes: 0
Dual tanks
Ok i need some help. I bought a 93 F350 2 wheel drive 7.5 truck. It has a service bed on it so i believe its a cab chassis. It was not running the greatest so i tuned it up and changed the front fuel pump which is a steel tank. The rear tank is plastic and i cut the sending unit so i could loop the lines and clamped them off with a pair of channel locks. Runs great now the problem is i ve been looking for the back pump and it looks like they discontinued everything for that truck. So my question is could you mount a inline pump back there? Only thing i dont understand is how the return would work? There would have to be a vavle to shut the return off on that when i switched to the front tank.
Logistics Pro
Joined: Nov 2013
Posts: 3,928
Likes: 1,198
From: Mojave, Ca
There is a shuttle valve inside the fuel delivery module (FDM) that prevents fuel from draining into the non-activated fuel tank. The shuttle valve is opened by the fuel pressure created by the pump.
Rock auto usually has pumps available for 9th gen Fords. I would check there.
You said you cut up your old FDM, so you'll need to purchase a complete new FDM. If your old FDM is repairable, you may be able to get away with just a new in-tank fuel pump.
Thread Starter
|
2nd Gear
Joined: Mar 2023
Posts: 2
Likes: 0
There is a shuttle valve inside the fuel delivery module (FDM) that prevents fuel from draining into the non-activated fuel tank. The shuttle valve is opened by the fuel pressure created by the pump.
Rock auto usually has pumps available for 9th gen Fords. I would check there.
You said you cut up your old FDM, so you'll need to purchase a complete new FDM. If your old FDM is repairable, you may be able to get away with just a new in-tank fuel pump.
Thats what i was thinking on how that worked. Thanks for the picture. So i just looked on rock auto and all the pump s are for the steel tanks and my rear tank is plastic. Do you think the steel tank fdm would work in the plastic one?
FTE Chapter Leader
Joined: May 2006
Posts: 12,335
Likes: 1,312
From: Central Mississippi
In looking at different versions/flavors of tanks, modules, wiring, etc,
What I see in differences between fronts & rear tanks is angle of the sump (reservoir) where the sock sits in the tank. Flat vs angle.
The angle of the send & return lines of the "hanger" are easily different. The harness plugs are bafflingly different but easily changeable
It's very, very doubtful that there is a 100% unique FDM or associated parts that were made for a particular service bed option & plastic tank and no longer available.
Have you got a pic of the module?
What I see in differences between fronts & rear tanks is angle of the sump (reservoir) where the sock sits in the tank. Flat vs angle.
The angle of the send & return lines of the "hanger" are easily different. The harness plugs are bafflingly different but easily changeable
It's very, very doubtful that there is a 100% unique FDM or associated parts that were made for a particular service bed option & plastic tank and no longer available.
Have you got a pic of the module?
Thread
Thread Starter
Forum
Replies
Last Post
Pjames
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
7
Feb 27, 2016 11:33 AM
energizedsbs
1987 - 1996 F150 & Larger F-Series Trucks
3
Jun 7, 2010 02:26 PM
