Quote:
Originally Posted by bishopts
Megahurtz has a good point about the low side check valve possibly being a choke point.
But... if it were, then you would see low side pressure being sucked down from the high pressure pump pulling from the line till it became a deficiency. It wouldn't stay even close to normal if it were losing enough volume to be 2000psi low.
And like i has said earlier. If the hpfp return valve is stuck open then you're going to see things like 200psi on the low side since it vents back into that line.
If the cam and follower aren't worn down then to me it seems like a high pressure pump.
But I've seen so many high pressure sensors fail on GM that i wouldn't rule that out. If you have the ability to check pressure with a gauge you would be able to determine that. If not maybe just throw one at it for good measure.
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yeah, I have been debating throwing in my old LT1 high pressure fuel pump and see just want happens at idle to see if it goes back to max or if it stays low like would be expected at idle. may tell me right away if it's the pump or not. not sure if there is anything that would need to be adjusted in the pump setting or not just for a start up and idle.
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2016 NFG 2SS.
Whipple 2.9, LT headers, Katech 103, Big Gulp, LT-4 Fuel, Alky Meth, FI Interchiller, BTR Stg 3 Cam, Forged Rods and Pistons, Circle D 258 - 860 WHP
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