97 TAHOE 5.7L VORTEC WON'T START...GM Merlin ideas?

[j cAT]

Originally Posted by jcass

Yes done all of that. Fuel pumps are a/c delco.

when the pump was removed what caused the failure ?

did YOU do this work ? IF not then I can't help you .

[jcass]

Originally Posted by j cAT

when the pump was removed what caused the failure ?

did YOU do this work ? IF not then I can't help you .

The fuel pump that I replaced last week. was not working. I haven't had a chance to check this one yet as it just quit this morning. Yes I did the work myself.

[jcass]

Originally Posted by jcass

The fuel pump that I replaced last week. was not working. I haven't had a chance to check this one yet as it just quit this morning. Yes I did the work myself.

I've never heard the fuel pump last week turn back on. Was hoping just got a defective fuel pump. I've checked the ground and the fuel relay and they both checked out good. Haven't checked anything else yet since it worked for a week.

[j cAT]

Originally Posted by jcass

I've never heard the fuel pump last week turn back on. Was hoping just got a defective fuel pump. I've checked the ground and the fuel relay and they both checked out good. Haven't checked anything else yet since it worked for a week.

the power and ground must be checked at the pump. the connector pins do get damaged.

splicing in the new connectors to the car wiring need be soldered and heat shrink to prevent voltage drop. the suction tube must fit tight. if the pump sucks air it will fail.

with the pump removed you must determine what failed.

low voltage /low fuel level will kill the pump quickly.


with the pump working what was the fuel pressures ? could have restricted return/supply lines fuel pressure test would show this .

[jcass]

Originally Posted by j cAT

the power and ground must be checked at the pump. the connector pins do get damaged.

splicing in the new connectors to the car wiring need be soldered and heat shrink to prevent voltage drop. the suction tube must fit tight. if the pump sucks air it will fail.

with the pump removed you must determine what failed.

low voltage /low fuel level will kill the pump quickly.


with the pump working what was the fuel pressures ? could have restricted return/supply lines fuel pressure test would show this .

Thanks for your quick reply. I check all of this as soon as I can and let you know the results. Didn't check the fuel pressure of the old pump but will this one.

[eddie_vandusen]

i am having a problem with my 2000 cadillac escalade 5.7l vortec it idles good and if i give it throttle slowly it will drive fine but when i give it alot of gas it starts sputtering and doesnt have any power ive checked the fuel pressure its good running at 52lbs and ive replace coil wires and plugs i hooked a computer up to it and it wasnt pulling anything but o2 sensor codes but i dont have cats on it so thats why its pulling those codes when i mash the throttle it acts like its loading up or doesnt have any fuel but my pressure is great the guy that hooked the computer up is a family friend thats a mechanic and he said all of the sensors look good tps and the other day i was driving on the highway and it got worse i could only go like 30mph and when i killed it at home it wouldnt start so i replaced the coil and it started again but im still having the same problem no power and sputtering can someone please help me and i checked the distrubitor cap and it looks good

[autojoe]

i would start new post.......may be an injector problem.

[eddie_vandusen]

Originally Posted by autojoe

i would start new post.......may be an injector problem.

I did start a new one i just havent had anyone post on it

[bigbluefan]

I have a 2000 Chevrolet Tahoe limited edition Z71 5.7 liter engine. I have had it for almost 2yrs. since I brought it I have been doing repairs to it because it will run for a few weeks then breakdown again. over the pass few months I have replaced the fuel pump , fuel filter, ignition pressure regulator, crankshaft position sensor, camshaft position sensor, coil pack and did a complete tune up. But it still won't start I have read the Chevrolet Manuel books for ideas of what could be cause of my truck not starting and have changed everything that I could think of. PLEASE HELP ME FIX TRUCK ASAP !!!!!!!!!!!!

[rhandwor]

Originally Posted by bigbluefan

I have a 2000 Chevrolet Tahoe limited edition Z71 5.7 liter engine. I have had it for almost 2yrs. since I brought it I have been doing repairs to it because it will run for a few weeks then breakdown again. over the pass few months I have replaced the fuel pump , fuel filter, ignition pressure regulator, crankshaft position sensor, camshaft position sensor, coil pack and did a complete tune up. But it still won't start I have read the Chevrolet Manuel books for ideas of what could be cause of my truck not starting and have changed everything that I could think of. PLEASE HELP ME FIX TRUCK ASAP !!!!!!!!!!!!

Go to Advance Auto or Auto Zone and get a free scan done and post the codes.

[bigbluefan]

Hey rhandwor I CAN'T take my truck to be scanned because it WON'T START AT ALL. I have tried spraying quick start in the engine a few times. it will start after I spay the quick start in the engine and stay on for a few second then cut off.

[bigbluefan]

Hey rhandwor I CAN'T take my truck to be scanned because it WON'T START AT ALL. I have tried spraying quick start in the engine a few times. it will start after I spay the quick start in the engine and stay on for a few second then cut off.

[j cAT]

Originally Posted by bigbluefan

Hey rhandwor I CAN'T take my truck to be scanned because it WON'T START AT ALL. I have tried spraying quick start in the engine a few times. it will start after I spay the quick start in the engine and stay on for a few second then cut off.

codes won't help with low fuel pressures.

350 requires 62-65 psi key on engine off. go get gauge and see what ya gut !

[bigbluefan]

Originally Posted by j cAT

codes won't help with low fuel pressures.

350 requires 62-65 psi key on engine off. go get gauge and see what ya gut !

how can you find out if you have low fuel pressure ? I just replaced my fuel pump and fuel filter

[rhandwor]

Originally Posted by bigbluefan

how can you find out if you have low fuel pressure ? I just replaced my fuel pump and fuel filter

Auto Zone and Advanced Auto have loaner fuel pressure testers.
Are you getting any sign of your anti theft system being on a man spent hours on the forum and his would start run around 1 minute and then shut down. After reading all of your problems I would at least watch your light for an indication.
This truck also has a fuel pressure regulator. I never heard of an ignition pressure regulator.
Use a noid light try Advanced or Auto Zone for a loaner. I think the anti theft will shut off power to the injectors.