Engine/Transmission (1998.5 - 2002) Fuel Pressure Drop

[EGaskamp]

I have a Carter 8psi pusher pump right next to the tank. At idle I'm stting at about 23-25 psi which is awesome and I thought I would have no more problems. Well, with the DD3's and the Drag on 5x5 or even 3x5, the fuel pressure drops down to about 8 psi. The lowest I've seen on my truck is 6 psi. What gives? I know trucks that are running 18- 20 psi at idle and never go below 13 psi. Does anyone know whats going on? It don't make sense to me. Thanks



Eric

 

[Mad Bomber]

Along with the pusher pump you must also put new lines from tank to VP,the A-N fittings have restriction than stock fittings. The pick up in the tank could also be clogged. That screen in tank is WAY TOO FINE. Hope this helps

 

[JSHAW]

Check your fuel filter. Or filters.

 

[EGaskamp]

What would be wrong with replacing the stock fuel line with the rubber hose like that on the part that goes to the pusher pump? Seems like it would be less restrictive. Thanks



Eric

 

[ceastmen]

Fuel Module mod

Eric ,

I can only speak from my expierences with our lift pump gremlins.

I have modified my fuel module like many others have on this site.

I am very happy with this modification. Use the search feature on

this site and see how people have done this to their module.

The problem is upstream of our pumps, small restrictive lines and fittings.

Once you have read these posts on this modification it will become

apparent that all of the larger pumps and lines are sucking through a straw

that chokes them. There are some very creative answers on the search

forum to read. Hope this can shed some light on the ongoing lift pump

blues!

Chuck E.

 

[tractorface]

Not sure I understand

How does opening up the downstream lines raise pressure? I am sure it is a good idea and will help deliver a better volume of fuel but raise pressure The smaller the downstream lines the higher the pressure. Think of it like your garden hose, put your finger over the end to raise pressure. Now opening up the feed line and losing the tank restriction should help. Don't get me wrong I agree with reducing the restriction on the supply to the VP I just question the theory that it will increase pressure. Maybe someone can help me understand if there is something I am missing here.

Thanks