Hi first post. This is probably a stupid question but I can't seem to find a definitive answer. I'm running a returnless system (GTO fuel pump) in my car which is a 68 MGB with a 5.3 Gen 3 motor which is all stock. I get about 62 psi at idle and light throttle. At WOT it drops to about 60 psi. This is probably ok but I'll ask anyway, is this ok or does it need to be rock steady?
Thank you!
Perfectly fine.
Technically you'd like to see 58psi if that is what the injector tables are set to but the little bit you are above that is just fine. It would only be a problem with fuel pressure if you floored it and it would go to like 50psi, that's a big drop and would need to be fixed.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
Thanks for the reply! I'm using a Harbor Freight gauge so it might be a little off!
Perfectly normal
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Thank you!Originally Posted by Alvin
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