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

**dec010974** · 02-28-2015, 10:07 PM

What is the proper Fuel pressure, for a LQ4, at the fuel rails, testing, using the Schrader valve? I have a FI, LQ4/TH400 and my fuel pressure is 50 PSI, at idle. This seems kinda low. The regulator is on the fuel rails, im using stock, flex fuel injectors, with a Walbro 255 inline fuel pump. I always thought that all LSx engine need 56PSI. With my current set up, it runs and drive but stalls badly when I Stump on the throttle. If I gradually press the throttle and increase speed slowly, it runs and drives with no problems it only stalls when I floor the throttle. thanks for your replies in advance, Clark.

02-28-2015, 10:07 PM	#1
dec010974 Senior Member Join Date: Oct 2012 Location: Miami, Florida Posts: 959	Fuel Pressure What is the proper Fuel pressure, for a LQ4, at the fuel rails, testing, using the Schrader valve? I have a FI, LQ4/TH400 and my fuel pressure is 50 PSI, at idle. This seems kinda low. The regulator is on the fuel rails, im using stock, flex fuel injectors, with a Walbro 255 inline fuel pump. I always thought that all LSx engine need 56PSI. With my current set up, it runs and drive but stalls badly when I Stump on the throttle. If I gradually press the throttle and increase speed slowly, it runs and drives with no problems it only stalls when I floor the throttle. thanks for your replies in advance, Clark.



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