2000 Chevrolet Tahoe - Fuel pump appetite

chevrolet

#1

Hello I have a 2000 chevy Tahoe 5.3 liter engine. I’ve replaced my fuel pump 4 times changed all the lines and the relay as well. It wouldnt start 3 times I tapped the tank all 3 and it fired up. Could I possibly need to replace ecm?


#2

No, why? Do you think the ECM is killing your fuel pumps?


#3

Not really sure but someone suggested maybe the fuel pressure regulator could be my issue.


#4

Also when it doesnt want to crank I can tap on the tank and itll start up.


#5

what is fuel pressure when it won’t start? Is the pump working? Are you sure you’re installing the correct fuel pump?


#6

Did you replace just the pump or the complete module, pump and housing?


#7

I’ll have to take it and get the pressure tested havent checked that but yes I’ve had it put in twice
By a mechanic.


#8

Dumb question. Did the mechanic do any diagnostic or just install fuel pump at your request ?


#9

Had diagnostic done at 90 bucks no issues in Virginia then drove to S.C. and it wouldnt
Crank so my cousin tap on the tank and I did it fired up so here goes pump
Number 4 or 5 now lost count and now it does the same thing still…


#10

I would be looking at the electrical connector for the pump.


#11

Thanks Twin Turbo I’ll definitely try that especially since it doesnt cost me to do that!! Lol


#12

Not cranking (turning over) means the starter motor is not engaging the flywheel and rotating the crankshaft. Knocking on the gas tank can wake up a fuel pump but probably has no effect on the starter motor and its circuitry.

Does it always crank (turn over) but sometimes fail to start?


#13

My apologies for not using the correct terminology. Yes it turns over just fails to
Start it may even attempt to run for a few seconds then does. I tap
The tank it runs.


#14

There are a lot of cheap knockoff fuel pumps out there for sale. They will get the car running but won’t last. Maybe upping the quality of the pump would help.


#15

It’s an AC Delco pump from Autozone the very first time the
Pump was actually bad.


#16

I’m in agreement with TwinTurbo about the electrical connection. A fuel pump is a high current consumer and over time that can lead to burning and corrosion at the pump connector.

That’s why parts manufacturers produce these.


#17

Well looks like I’ll be purchasing one and installing it so I can stay away from this issue thanks


#18

The AC Delco fuel pump assembly from Autozone comes with the harness pigtail, did you install it?


#19

Never installed in fact I think it’s been riding state to state with me the past 2 weeks


#20

I and other people I’ve known have long had issues with Chevrolet/GM fuel pumps going out repeatedly. It’s generally on models from the late 90s to early 2000s. I have no idea what causes it, but I know they tend to go out unexpectedly, and it costs about $700 plus a tow to get it fixed. I know one guy who cut a hole in the bed of his truck so he could access the fuel pump without having to drop the tank.