well your on a 12v system but a diesel will should be a strong 13 to 14. so i would say you should have atleast 12v at the pump.

 

if you have an in tank pump that must be still hooked up for the ddrp to get fuel. a ddrp or fass will not pull fuel through an in tank pump. your in tank pump is probably crapping out. this means time to pull tank and add a draw straw or sump.

 

I ran my in tank pump and a CarQuest block mount when I first got my Dodge. I made a Y connector to hook into the factory harness for both pumps. One end to the harness, one for the block pump, and the other for the relay to the tank pump. This way the current draw wouldn't be too high from the ECU/PCM. It made 29 PSI at low idle, and dropped to 15 PSI at WOT with the EJWA on 5. Too much at low, and dropped significantly under load. When I put my FASS in I put a a draw straw in as well. I'm tired of the 1/4 tank issue so I will be putting a Vulcan Draw Straw V in soon.

Voltage at the pump shouldn't be much less then system voltage, running or not. Try probing for voltage with the pump running if you can by back probing the connector. Disconnected you may find proper voltage, under load with poor connections will be different. To check the in tank pump you can unhook the DDRP, bump the starter and listen around your fuel tank. You should be able to hear it.

 

if i have an in tank pump can i just take it out? and how do i make sure if i have a in tank pump?

 

That's funny, because my pump pulls through the in-tank just fine.

 

When the factory in tank pump starts to fail, does it also cause the factory fuel guage to reas incorrectly? If I remove the factory fuel pump will I have to replace the fuel guage sending unit aswell, and how does the draw straw work, where can I purchase the necessary parts to do this modification. 98' Dodge 24v diesel, Thank you, Kerley

 

If Dodge got a hold of your truck and put a pump in the tank there is more than likely an extra relay under the dash. At least there is on mine. A harness will run from the engine lift pump harness to a relay to activate it, then another harness down the frame rail to your tank.
There is a high possibility that if the pump is failing and the sender unit it is a wiring issue. Not to say both have fail, that is possible as well.
You can buy kits from Vulcan that can turn the fuel pump basket into a high flow unit, or buy an entire sending unit from them with the kit installed.
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I have a very basic draw straw in mine currently, a 1/2" stainless draw straw, and it poses a 1/4 tank issue due to fuel slosh. I have ordered a Vulcan Draw Straw V, and will be installing it as soon as I can. If my module had failed, I would have bought the LibertyFuel Module w/ DrawStraw™ Installed. High flow capabilities with a new sending unit for LESS than the Dealerships would charge for a sender alone.

 

raptor 150 thats you fix
aint never had a problem yet

 

If i keep my fuel pressure above 5 psi will i be ok.

 

Needs to be above 10