Last November my original LP and IP failed. Both were replaced at the same time.  The LP was a Napa stock replacement.  It failed when I got home from a 900 mile trip. I took it to a shop and they diagnosed the LP failed.  When I got it back with a new LP and pressure gauge, the LP failed after 2 weeks.  I took it back to the same shop, it's under Napa's warranty, they replaced the LP again.  Got it back, 2 weeks later the LP failed.  Being fed up with the Napa LP dying, I researched online on aftermarket pumps.  I settled on the FASS 95gph mounted close to the fuel tank.  Got it started and running great.  This past weekend, I drove it to pick up a heavy load of wood, the weather was warm but not hot.  After I loaded the wood I tried starting it, it took a longer crank than usual, but it did start.  When I got home I tried it about an hour later, same thing, longer crank time than usual.  I have another long trip in a couple of weeks and don't want to be stranded.  Is it possible that the IP is going out or that the LP has too much fuel pressure for the IP?  I have the add a fuse connected in the cab of the truck to fuse 9.

21 hours ago, DoggyDiner said:

The FASS has an inline fuse and a relay before the wire to the fuse box and FASS fuel pump

I missed the part you have relay. I lost it in the translation somehow. What IBMobile says above is what you need to do. That will take it off of a key on hot that runs the pump constantly and put the ECM in charge. Sorry for any confusion I caused.

Edited August 19, 20204 yr by JAG1

Everyone explains it very well and has their LP wired like it's supposed to be for safety and easy fast starts. Only thing I can add is that the relay is controlled by the ECM, but the power comes directly from the Batteries. If you let the ECM (power) the LP, like the factory harness, you risk frying the ECM when you get a LP failure due to possible electrical overload. Relay allows power from the batteries, but the ECM can still control how much power, for lower starting pressure and when to give full connection for full fuel pressure or shut down when in an accident.

Edited August 19, 20204 yr by JAG1

OK,

 

so now i'm confused. should I not connect the wire I have run to the fuse in the cab to the yellow and white wire on the old LP pigtail?

59 minutes ago, DoggyDiner said:

OK,

 

so now i'm confused. should I not connect the wire I have run to the fuse in the cab to the yellow and white wire on the old LP pigtail?

 

1. Disconnect wire in cab from fuse in cab.
2. Remove wire from cab.
3. Attach wire, that you have removed from cab, to the yellow and white wire on the old LP pigtail.
4. You're done; go have a drink.

thanks for the simple explanation.  Drinks on me.

Thanks to all that replied to my post.  I was able to connect the wire from the cab to the yellow/white wire and Bob's your uncle, it worked.  Another issue with surging cropped up while test driving it.  Thanks to Mopar1973Man's article and video I was able to reset/calibrate the APPS which cured that issue.