hey i have a 01 blazer i have been having hesitation problems and back fire through intake under load. This happens the last 2 times i filled my tank its not bad gas. it only does it until the gas is under half a tank then it stops and runs normal. i did sea-foam,egr tube, o2 sensor, fuel filter , maf clean plugs , wires , distributor im lost i have no clue what to do. last time i had it at the mechanic (2 months ago) fuel pressure was good. my gas gauge does not work under half a tank the mechanic told me its a ground issue i just thought id tell yall every thing aha. if someone could help me it would be must appreciated. this problem is the only problem im having now with it and its driving me nuts.

 

When you say the fuel pressure is good, what was it at? key on, engine off? and how long did it hold for before it began to drop off?

 

i don't know the mechanic i took it to said fuel pressure is where it should be. I know the fuel pumps are weak on these trucks so i got it checked out to be safe.