Incorrect fuel pressure Key on and Engine Running

[Matthew Jeschke]

Welp I've got an aftermarket pump in the truck / sending unit now. Saved all my notes:

NBS 2nd gen Tahoe Fuel Pump Upgrade - Matthew Jeschke

Have you been chasing fuel problems? Bad gas mileage on your Chevy Truck? Then you are in the right place. I built up a 2001 Tahoe with a LQ9 (6.0L LS). Initially Fuel mileage was BETTER than the smaller 5.3L LM7 I replaced. However, somewhere along the line my gas mileage dropped by nearly...

matthewjeschke.com

It didn't solve my fuel pressure problem lol I think what happened is OEM is now selling a single pressure in their regulators. They must have taken pressure from the flex fuel L59 engine and made the gasoline regulator the same. Despite these two regulators & fuel rails are different sizes!

I'm going to buy a regulator that specifically says 55 PSI and see if it raises the pressure. I'm out of ideas and nobody makes a drop in adjustable regulator.

 

[exp500]

Did you ever try an aftermarket big block pump assy for a cheap test

 

[Matthew Jeschke]

I did not. Would be interesting. Pump I installed is 340LPH

I found out Bosch makes a similar pump for 300 LPH at 40$ maybe would have been a better option. Although I have had some troubles with Bosch parts. My starter only lasted 10k miles from them.