Relay's seldom ever go?
AC Delco relay for replacement?

Might want to check the LP itself for excess current draw?

Also the OPS is a secondary backup power supply for the LP on 96+ so if your LP has no power you have 2 problems.

I would also check the LP harness ground for good clean contact-it should be fastened to the frame near the LP.

 

I jumped the pump right from the battery.. it comes on but the the truck won't start, lots off fuel out off the filter bleeder..nothing out off the injector.. does the LP has to be plugged in to the harness along with the hot wire in order to start.

 

I replaced it with AC Delco, I couldn't get that OPS to move, I just towed the truck home so Ill give that another try.

 

Yes it does...but if relay went that quick id check for bare wires,grounds and for shorts.....

 

Yeah I put another Fuel Pump Relay on.. fires right up, then it dies again.. defiantly grounding out some wheres.

 

Nope, you can run with the lift pump hotwired.

Have you sucked air into the Injection pump? That can create a hard start situation.

Have you run 3/4 gallon of fuel out the T drain with the lift pump jumpered? I use a glass pickle jar. Note the flow rate. Leave the jar sit for 20 minutes and look for water bubbles and crud.

Have you changed your fuel filter? It doesn't matter how recently it's been changed. One bad tank full and you can have problems. I usually run a bowl full of Sea Foam through when I change the fuel filter.

Did you use an AC Delco lift pump?

A fuel leak anywhere in the system back to the tank could cause you an issue.

DO NOT USE ETHER!

You can always run a filtered line from a container directly to the injection pump. Just run another line from the FFM back to the container. When I pull the line off the injection pump to attach the line from the container, I use a double barb on the line I take off to attch the line running back to the container.

Have you checked the fuel shut off solenoid?

Have you checked your fuel cap? Try the truck with the fuel cap loose. Though they usually do not die that fast with the fuel cap issue.

I'm guessing your problem lies with a plugged tank sock, a leaky fuel line or Fuel Filter Manager or something else that is interrupting your fuel supply. Running the 3/4 gallon of fuel out and noting the flow rate should tell you something. Also look for air bubbles.

Have you disconnected the injection pump return line and run it to a container? A plugged return line will kill the engine.

I have had to replace 4 FFM's in recent history. Usually they leak noticeably - in my experience. I have also had to replace all the fuel lines running from and to the FFM's. This might be a good thing for you to do as long as you are working on the vehicle. If you do replace the fuel lines, use only line that is rated for bio-diesel. Might also be a good time to rebuild your FFM. Try leroydiesel.com for orings and such

 

Have a look at this thread for some more info:
DIY: itermitant fuel problem - Page 6 - Diesel Place : Chevrolet and GMC Diesel Truck Forums

 

It's a AC Delco.. haven't changed the fuel filter lately. It had air.. I opened the injector till all the air was out, let it idle for about 15 mints, I only went about 100ft when it stopped.. and I don't hear the LP come on. One thing that I noticed the last time I filled the truck with fuel that the top off the tank was a little damp.. would that cause the FPR too go. Going too get a new filter and pull out the tank.