Losing Fuel Pressure - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bobbyh68 · 07-11-2017, 01:43 PM

I have a 2005 LQ4 6.0 thats losing fuel pressure after engine shuts down. 58psi
while running and slowly drop after turning off. overnight it will drop to zero.
Im using the stock 6.0 in the tank fuel pump with a corvette regulator/filter combo.
1st. Replaced fuel pump (Walbro 255) with no change. Still have pressure drop!
2nd. Replaced entire tank pump assembly and no change. Still have pressure drop!
3rd. Removed spark plugs and put camera inside cylinders, no fuel dripping?

I give up, any ideas?

07-11-2017, 01:43 PM	#1
Bobbyh68 Registered User Join Date: Jul 2008 Location: Summerville SC Posts: 42	Losing Fuel Pressure I have a 2005 LQ4 6.0 thats losing fuel pressure after engine shuts down. 58psi while running and slowly drop after turning off. overnight it will drop to zero. Im using the stock 6.0 in the tank fuel pump with a corvette regulator/filter combo. 1st. Replaced fuel pump (Walbro 255) with no change. Still have pressure drop! 2nd. Replaced entire tank pump assembly and no change. Still have pressure drop! 3rd. Removed spark plugs and put camera inside cylinders, no fuel dripping? I give up, any ideas?



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