low fuel pressure, HELP!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1972BlueC20 · 12-14-2014, 11:26 PM

New engine installed. I've tried 2 different mechanical fuel pumps and 4 different fuel filters and still getting 2.5-3 psi after truck is at full operating temperature. It starts out at 6 psi at cold start. Trucks running ok even after pressure drops, but I don't think it's right. Also getting air bubbles in the filter after pressure drops.

My next move is to check sock on sending unit, then replace fuel line from tank to pump.

Is there anything else that could cause low pressure??

12-14-2014, 11:26 PM	#1
1972BlueC20 Registered User Join Date: Jun 2014 Location: Houston, Texas Posts: 722	low fuel pressure, HELP!!! New engine installed. I've tried 2 different mechanical fuel pumps and 4 different fuel filters and still getting 2.5-3 psi after truck is at full operating temperature. It starts out at 6 psi at cold start. Trucks running ok even after pressure drops, but I don't think it's right. Also getting air bubbles in the filter after pressure drops. My next move is to check sock on sending unit, then replace fuel line from tank to pump. Is there anything else that could cause low pressure?? __________________ 1972 Chevrolet C20 Cheyenne Custom Camper LWB - 350 / 330 HP GM Crate - TH350 / Mild Shift Kit - Dark Blue / Medium Blue - Paint Code 559



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