99 Z71 won't start on the 1st try

[Points]

My truck (1999 Chev 1500 5.3) will not start on the 1st try, but the 2nd try to does start with help with some gas. Sounds like to a fuel pressure thing to me. Any ideas guys?? I replaced the fuel filter about 5k miles ago. It started about 100 miles after i put MMO in my gas tank.

Thanks,

Nate

[ August 30, 2003, 12:01 AM: Message edited by: Points ]

 

[buster]

I think it's bc of Mobil 1.

 

[Points]

MMO = Marvel Mystery Oil

 

[Hirev]

Why would you put oil in the gas on a 4 stroke?

 

[Steve S]

Marvel oil won't do damage ,is there pressure in the fuel rail after the motor sits for a while? that is what I would check if I knew anything.

 

[sbc350gearhead]

Try turning the key to the on position for a few seconds before you bump the ingition. Listen for the fuel pump. Then bump the ingition and see if it starts on the first try.

 

[ZR2RANDO]

You may have changed the fuel filter, but the fuel pump screen can still be clogged/partially clogged. See if the following makes a difference..
At the first startup, turn the key to the on position(not start), and see if you hear the pump building up pressure. You normally can hear the pump for a few seconds and then it stops. Try cranking it at that point and see if it helps. If that makes a difference it sounds like it takes a second to build up pressure.
Otherwise it sounds more like normal time for a tuneup.

I just read the post just above.....sounds like we have the same idea..

[ August 30, 2003, 07:16 AM: Message edited by: ZR2RANDO ]