2005 5.3L losing fuel pressue
#1
2005 5.3L losing fuel pressue
Brand new to the forum, thanks to the new-to-me '05 Suburban we just got. Just in the last week, it has gotten to where almost every time we start it, it cranks for 3-5 seconds before starting. Priming with the key on a few times helps. I checked fuel pressure at the rail this AM and here are the readings:
1: after sitting all night = 0 PSI
2: Key On Engine Off = 61 PSI
3: Running = 61 PSI
4: Leak down test = 0 PSI within 3 seconds of shutting off the engine.
So, obviously it's losing pressure almost immediately. I assume from what I've read this means I'll be dropping the tank to replace the pump. However, the Haynes manual says for the flex fuel engines, KOEO should be 48 - 54 PSI and running should be 3-10 PSI lower than KOEO. While I have the tank down, do I go ahead and replace the fuel pressure regulator as well?
Is there anything else I might be overlooking (I will obviously check the hoses from the tank to the engine before dropping it, but it runs perfect once it's started so I doubt that will be an issue.
Thanks,
-Chris
1: after sitting all night = 0 PSI
2: Key On Engine Off = 61 PSI
3: Running = 61 PSI
4: Leak down test = 0 PSI within 3 seconds of shutting off the engine.
So, obviously it's losing pressure almost immediately. I assume from what I've read this means I'll be dropping the tank to replace the pump. However, the Haynes manual says for the flex fuel engines, KOEO should be 48 - 54 PSI and running should be 3-10 PSI lower than KOEO. While I have the tank down, do I go ahead and replace the fuel pressure regulator as well?
Is there anything else I might be overlooking (I will obviously check the hoses from the tank to the engine before dropping it, but it runs perfect once it's started so I doubt that will be an issue.
Thanks,
-Chris
#3
The regulator should be at the pump, since it's a 2005 with the "returnless" fuel system. I guess my question is should I just suck it up and replace both while the tank is out?
Thanks,
-Chris
Thanks,
-Chris
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Aaron@Airlift
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August 2nd, 2012 9:33 AM