Fuel pump pressure

[Jimmyy]

What should the fuel pressure be for a 2006 6.0? If I can believe my Chinese pressure gage I have 50psi when the pump is running and 40psi once the pump is off. It holds at 40psi. The engine is hard starting and will run for a second or 2 and as long as 20 seconds and then stops. I have no idea how old the fuel pump is. 255k miles on this one.

 

[rockola1971]

What is the pressure at idle? How about 2k Rpm's?

 

[noodlesandsam2]

Fuel Pressure, and does the pump run are two different things. I would get about 100K per pump in the 01 1500. Pressure means you start easily, but if the pump is getting old, and decides to stop pumping, you can stall. I would do the pump for sure at 255K - it may solve other crimes as well. It's not a fun job to do the correct way. When my 01 got to 250K, and the pump died, I went the route of cutting the floor above the tank, and pulling it. I did do the tank drop in the past, but at the end I was too fed up. The 'new' 02 2500 has both pumps new, and I did not have to do it : )

 

[Jimmyy]

What is the pressure at idle? How about 2k Rpm's?

Doesn't run long enough to check. Mostly it run for about a second. It's not the pass lock because it did run for 20 seconds but I didn't have the gauge on it.

 

[Jimmyy]

I picked up a new AC Delco fuel pump from Rockauto.com. I'll be farming this job out. I'm guessing there's about 8-10 gallons of fuel in there. I replaced one in my Safari van years ago and that wasn't very fun. From what I can find on the Google machine it should be 60+ psi with the pump on and 50 psi sitting.

 

[Fless]

Might be good to consult service data before throwing parts at it. Haynes (not the best, but...):

For fuel pressure, according to Haynes:
KOEO (key on, engine off)
Flex Fuel: 48-54 psi
Non-Flex: 55-62 psi
Easy enough to test without running the engine.

If the pressure is in spec, turn the key off and see if it holds somewhat steady or drops like a rock.