2001 5.7 vortec, chronic starting problem

[68ragtop]

UPDATE:

Problem solved after years of issues.......

Last week my fuel sending unit started to read incorrectly. So, I had to pull the tank & I replaced the fuel pump/tank unit. Turns out the fuel pump was the casue of my chronic starting problem.
Now, with the new pump, the pressure jumps to 60psi within 1 second of turning on the ignition. it also holds the pressure after the pump stops cycling. The old pump took twice as long to get to 60psi & when the pump would stop, the pressure would drop right back to 0 psi within a couple seconds. Start faster than it has for as long as I have owned it (5 years) & it idles smoother too.

68RT

[MT-2500]

Thanks for posting back how it went.
Did you run the fuel pressure test as outlined?
If you did you should have found the problem.
Also good idea to check the pressure after replacing the pump.
You should see 64-65 lbs. prime up and engine cranking.

If you used a Delphi fuel pump instead of a junk Airtex you should be good to go.

[68ragtop]

I never got a chance to plug off the return line a second time, so I didn't get that. I had only monitored the voltage. I bought a used assembly from a low miliage wrecked express. I figured a GM one used was way petty than any aftermarket unit. Thing was, from day to day the van ran fine. Its used in the service feild every work day & for the most part, it always ran fine, just would excessivly crank about once every 6-8 starts.
One of those nagging things that I just put off.

Glad its cured, it seems to run better than it has in the past 30K miles.

Thanks for all your help!

68RT

[MT-2500]

Originally Posted by 68ragtop

I never got a chance to plug off the return line a second time, so I didn't get that. I had only monitored the voltage. I bought a used assembly from a low miliage wrecked express. I figured a GM one used was way petty than any aftermarket unit. Thing was, from day to day the van ran fine. Its used in the service feild every work day & for the most part, it always ran fine, just would excessivly crank about once every 6-8 starts.
One of those nagging things that I just put off.

Glad its cured, it seems to run better than it has in the past 30K miles.

Thanks for all your help!

68RT

You are welcome and good luck.

[Noshadetony]

I have a 2000 Chevy 2500 express when I purchased it it had a cool start problem. The past owner put spider injector, ignition coil, feul pump, crank and cam shaft sensor, disturbtor and wires, plug, tps and still no fix to the cool start problem, WELL YESTERDAY While I was chasing wirer problem I ran across the true problem for my van. A BAD CONTACT for the fuel pump relay. I made the wires in the fuse box under the hood have a tight fit to the relay and now the van starts like new. Because that fuse box is in a tight space , when taking off or putting on the cover to it, it loosen the fuel pump relay that is located close to the driver side fender. I hope this helps someone, cause it cost me nothing, just some time.