I just recently joined because I've purchased a 2000 Dodge Ram 2500 4X4 with the 24V Cummins engine.  I'm not very familiar with this engine so I'll be looking for help shortly I'm sure.

Welcome. This is a great place for help. The only stupid question is the one you dont ask.

Dave is right ask plenty of questions every if it sounds silly or stupid because that's have your going to learn about your truck.

I just checked the lift pump pressure on the 2000 Dodge 2500 I just bought and it showed 7 psi.  Is that enough?  I don't want to be out a lot of money having to replace the injector pump.

 

Probably not!

If thats at idle you are probably at 0 at WOT. Post up a thread over in the 2nd gen forum and and you will get much more exposure for your issue. 

 

To answer, your pressure is way to low.

You need 14 to 20 PSI would rolling down the highway at WOT. 

 

 

I just discovered that this truck has had a conversion to where the lift pump has been relocated to the fuel tank and not on the block.  But the fuel lines are still attached to the block mounted pump but no wiring is attached to it.  Could this be why my fuel pressure is low?  Is there a way to bypass the block mounted pump with the fuel lines?  There are banjo bolts on both sides of the pump.

If it is pumping thru a bad block mounted pump, that could hurt the pressure. But the intank pump itself is nothing to write home about. I had the in tank pump but Dodge removed the block mounted pump. I do believe the fuel lines ram thru the area of the block mounted pump but it was removed. Are sure the pump is still ther? The bracket has to remain but my pump was gone. The bracker covers the hole where the old 12v mechanical pumps went.

Edited August 26, 20187 yr by dripley

2 hours ago, hrenfroe said:

I just discovered that this truck has had a conversion to where the lift pump has been relocated to the fuel tank and not on the block

 

At any rate, all that stock plumbing has to come out. It's just too small of pipe for what the engine requires. All the banjo line are 6mm (0.23") This is smaller than 1/4" fuel lines. Our engine does the best with full 1/2" lines and keeps the pressure stable over a wider range of fuel demands. 

 

When my in-tank pump was installed the fuel line ran through a block that replaced factory pump so the fuel lines didn’t need to be modified. 

3 minutes ago, Royal Squire said:

When my in-tank pump was installed the fuel line ran through a block that replaced factory pump so the fuel lines didn’t need to be modified. 

 

This is correct. But still in all the line size is too small.

46 minutes ago, Royal Squire said:

When my in-tank pump was installed the fuel line ran through a block that replaced factory pump so the fuel lines didn’t need to be modified. 

I am remembering now. @hrenfroe is that possibly what you are seeing?

 

45 minutes ago, Mopar1973Man said:

 

This is correct. But still in all the line size is too small.

Agreed.

OK, so what all this means is installing a draw straw in the tank, getting a relocation kit with 1/2" lines and  installing a FASS (100  gpm?) pump?  I also assume I'll have to figure out which wires to remove from the tank mounted pump and adapt them to the FASS pump.  Am I close?

For the most part yes. Both AirDog and FASS both come as a complete kit. This means supplied draw straw, electrical, pump, and all plumbing. You end up removing everything from the fuel tank to the engine and replacing. The only thing I will suggest with either kit is to get the Vulcan Big Line Kit so you keep the stock fuel filter can.