fuel system help on silverado
02-13-2007, 08:58 PM
#1
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fuel system help on silverado I pulled the 4.8 out of my 99 silvy this weekend and installed a Lq9,cammed,ls6 intake 42lb svo's.My stock rail had the regulator built in, but I went with a single f-boby rail so I got a vette filter/regulator and plugged that in my stock lines.I took the truck to the dealership to use there fuel gauge , it had 60lb idling and if I touched the throttle it would drop 5 psi. Should I upgrade to a 255 intank or do something different. Stock pump has 105,000 miles on it. Help me out guys are the 42's too big, jesse did the tune.
02-13-2007, 09:15 PM
#2
60-62psi is pretty common with a 255 pump at idle.
You should see 58 just off idle , but depending on the gauge, it could be off 1-2psi as well.
Your concern should be pressure at full throttle. If it drops too low, then you need to consider upgrades to the rest of the system.
You should see 58 just off idle , but depending on the gauge, it could be off 1-2psi as well.
Your concern should be pressure at full throttle. If it drops too low, then you need to consider upgrades to the rest of the system.