Tahoe not starting under 1/4 -1/2 tank

[chauncey0337]

Reread first post...

I have a '03 Tahoe Z71 5.3L Flex Fuel and it will not start under 1/4 - 1/2 tank sometimes. It doesn't matter on the temperature or anything, it just sometimes starts and sometimes doesn't when under 1/2 tank. I have read in other threads that this could be due to the fuel pressure regulator, fuel filter, or fuel pump. I have replaced all three of those with brand new parts and the problem persists. It always starts above 1/2 tank with no problems. Spark plugs, battery, and alternator are new as well. Does anyone have any ideas? Any help would be greatly appreciated.

 

[EKJ]

Sorry for not reading closely enough. Hook up a preassure gauge and see what you get when the no start event happens. Ignition tester would also be helpfull in this case.

Oil preassure sensor and ignition switch might be a tip ..... Even if it dosent have anything directly affect with the half tank issue.

Sent from my GT-I9100 using Tapatalk

 

[hcex98]

Sorry for not reading closely enough. Hook up a preassure gauge and see what you get when the no start event happens. Ignition tester would also be helpfull in this case.

Oil preassure sensor and ignition switch might be a tip ..... Even if it dosent have anything directly affect with the half tank issue.

Sent from my GT-I9100 using Tapatalk

For the pressure gauge and ignition tester, are those both items that I would be able to rent or borrow from an AutoZone or other parts store?

 

[EKJ]

http://www.lislecorp.com/divisions/products/?product=366

http://www.lislecorp.com/divisions/products/?product=68&division=1&category=8

I'm not sure if you can rent this... But the Pressure tester i linked to comes in cheaper versions.

The spark tester is great, if it dont start and the tester dosen't Flash You got a ignition problem.

 

[hcex98]

http://www.lislecorp.com/divisions/products/?product=366

http://www.lislecorp.com/divisions/products/?product=68&division=1&category=8

I'm not sure if you can rent this... But the Pressure tester i linked to comes in cheaper versions.

The spark tester is great, if it dont start and the tester dosen't Flash You got a ignition problem.

Thanks for the links. The spark tester is cheap anyways. I will have to try that first

 

[firehill]

My wife's '03 Burb does the same thing. Its worst when on an incline like our driveway is on our house since 2006. When it did this, i would coast it out of the driveway to level ground and put a few gallons in the tank. It would take a little bit, but would finally start. Yeap, sounds just like it was out of fuel, but it wasn't. Hasn't done it in a while, but think she finally learned to keep it above 1/4 tank.

 

[hcex98]

My wife's '03 Burb does the same thing. Its worst when on an incline like our driveway is on our house since 2006. When it did this, i would coast it out of the driveway to level ground and put a few gallons in the tank. It would take a little bit, but would finally start. Yeap, sounds just like it was out of fuel, but it wasn't. Hasn't done it in a while, but think she finally learned to keep it above 1/4 tank.

Yea, that's what I have been doing so far. Every once in a while though I will run it in between 1/2 and 1/4; then I'm stranded somewhere.

 

[kjeag]

Just get a new fuelpump. I had the same problem at my '01 Tahoe, my fuel gauge was also not very accurate.
But after i changed this unit last weekend, everything works great.

 

[Gzes]

Have yall figured it out yet? My buddy can't have 1/4 or less since it has nasty hunk in it. Might be that guys... Try to clean the tank