Is 65# too much fp for a stock 5.3 ?

 

My heads/cam/full bolt-on WS6 has 65 to 66 fuel pressure at idle. At least my Glowshif fuel pressure gauge says so. Don't think it's anything bad.

 

what fuel pressure are your injectors set up for? 58# is stock.

 

So if the pressure drops to 50 the motor will starve / hesitate ?

 

If your injectors are rated at 58 psi, then running them at 65 psi will give you a 5% increase in fuel flow(gpm).

New Flow Rate = (Flow_Rate@58psi) *SQRT(65/58)

Durability wise, I don't think it's an issue, but if you're doing VE tuning, then you would probly want to update the IFR(Injector Flow Rate) table so the ecm knows how much its actually injecting.

 

Fuel pressure should be consistent regardless of RPM. Stock LSx fuel pressure is 4 bar, aka 58 psi.

Andrew

 

I had a feeling I put the wrong (flexible black) hose from the filter to the pump in the fuel tank, it was suppose to be the hard hose.
Hose must be collapsing under pressure.

 

http://www.oreillyauto.com/site/c/de...0887&ppt=C0222
you need this type of hose.