gas delivery pressure to fuel rail
04-16-2018, 08:44 AM
#1
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gas delivery pressure to fuel rail Hey Techsters.. Just now getting started on installing my 2002 stock 5.3 LS Yukon engine in a 1953 pickup so the gas delivery issue is my concern. What gas delivery pressure does this engine require since the engine was separated from the rest of vehicle. I'm expecting to procure a new gas tank to fit my project vehicle so I'll need to acquire the new fuel pump with a pressure regulator ? Anything else I need to consider ? Your thoughts ...
04-16-2018, 10:16 AM
#2
TECH Senior Member
58psi....
04-25-2018, 01:11 PM
#5
TECH Senior Member
ALL fuel injection systems on LS engines are return style, even if the regulator/return is in the fuel tank. The pressure at the rail should be 58psi on any OEM system, I think that is what the OP asked for
Last edited by G Atsma; 06-16-2018 at 09:41 AM.
06-15-2018, 11:56 PM
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I just unplug the vacuum line to the regulator, the pressure went up to about 52 psi, will check the filter next then drop the tank
Which type of injectors do you have? There is an 8 digit part# on side of each injector. What is the number. Different fuel pressure spec for FLEX FUEL engines.5.3L Flex Fuel engine 2001-2004, 48-54 psi with vacuum line disconnected
5.3L Standard Fuel 1999 to 2003, 55 to 62 psi with vacuum line disconnected
This is from LS1tech post #18
https://ls1tech.com/forums/conversio...e-driving.html
Flex fuel engines on some years run a lower psi.