slow_c1500
I'm Awesome
Hey all, I started a thread almost a year ago about this issue that Ive been inactive on because of college, but now that im gonna have time to work on the ol girl again, I figured Id start a new thread with a quick recap of what we found out in the old thread. Anyways, its a 96 5.7 vortec. New GP Sorenson MPFI spider/regulator, new fuel filter
Findings/symptoms:
- Normal start when sitting less than ~15min or overnight.
- Hard start when sitting over ~15min but less than a day.
- There seems to be a fuel leak somewhere, but i havent noticed any drops on the ground at all
- 60psi fuel pressure when pump is running, drops to 57psi 2 sec later when pump shuts off, continually drops slowly after that.
- I also tested clamping the different fuel hoses to see if the pressure drops differently:
With either the inlet fuel hose clamped, or both hoses clamped, as soon as I let go of the pliers, the psi instantly dropped about 12 psi. With the return hose clamped, when I let go of the pliers, the psi didn’t drop. It basically behaved the same as if nothing was clamped. I did the calculations and the psi dropped the fastest when either the inlet hose or both were clamped. For both of them, it took ~30-35 seconds to drop 1 psi (not including the instant 12psi drop after releasing clamp). The psi dropped considerably slower with nothing clamped, or only return hose clamped. Bottom line: whatever is leaking, it leaks faster when you pinch the inlet hose or both hoses.
Any suggestions or guesses as to what my issue is? Thanks
Findings/symptoms:
- Normal start when sitting less than ~15min or overnight.
- Hard start when sitting over ~15min but less than a day.
- There seems to be a fuel leak somewhere, but i havent noticed any drops on the ground at all
- 60psi fuel pressure when pump is running, drops to 57psi 2 sec later when pump shuts off, continually drops slowly after that.
- I also tested clamping the different fuel hoses to see if the pressure drops differently:
With either the inlet fuel hose clamped, or both hoses clamped, as soon as I let go of the pliers, the psi instantly dropped about 12 psi. With the return hose clamped, when I let go of the pliers, the psi didn’t drop. It basically behaved the same as if nothing was clamped. I did the calculations and the psi dropped the fastest when either the inlet hose or both were clamped. For both of them, it took ~30-35 seconds to drop 1 psi (not including the instant 12psi drop after releasing clamp). The psi dropped considerably slower with nothing clamped, or only return hose clamped. Bottom line: whatever is leaking, it leaks faster when you pinch the inlet hose or both hoses.
Any suggestions or guesses as to what my issue is? Thanks