fuel pressure problem

[gomerpile]

ok so i got my fuel pressure gauge in and found something horifing . my idle fuel pressure is 6 psi and my full throttle is 2psi. here is my question

my filter has 6500 miles on it. would that be the problem possibly?

my fuel pump has 5000, i dont think it is it, but 2 yr warranty

would my new 40 horse injectors cause that little at idle , could it have to do with the fact im running to little timing ( working on it).

or the last/ easiest, is could it be the gauge? i ran 1/4" line to the gauge, didnt bleed fuel thru line to the gauge, and the tube runs thru a 1/8" needle valve right out of the banjo bolt.

[PToombs]

Oh Gomer!
Those pressures aren't too bad, but a little low. Timing won't affect fuel pressure. The injectors could. You should have bled the line to the gauge. I left extra hose on mine, I pulled it out of the dash, and put a pan under it. I started the engine and bled it out at the gauge nut. Then I adjusted the needle valve to eliminate bounce.
The stock pump doesn't put out a lot of fuel. If you see the gauge drop more, it's time to upgrade to a piston pump.

[dpuckett]

6psi idle is about right, a little low, but not bad. 2psi WOT is BAD- Cummins spec is 3psi+. How much boost do you make at WOT? With stock injectors, and a 160mm pump output, I can su.... uh, bring my fuel pressure down to 0. If I keep the boost around 20psi, pressure stays around 5psi, which is adequte for stock, and no less than the pump is designed for.

If you have stock fuelling, and 40hp injectors, you have a bad lift pump.

Daniel