Bad fuel pump?

[lkrasner]

02 Tahoe 4x4 5.3 Flex. 330,000 miles.

I think my fuel pump died last night. Hoping it could be something else. I slowed down to a stop sign, it stalled and would not restart. Fuel pump is not coming on to prime (I can usually hear it, but it's silent. I swapped the fuel pump relay, still nothing.

The odd thing is this pump only has about 40k on it.. No way it should have just suddenly died like that. Of course I just got a full tank of gas 20 miles before it happened. Is there anything else I can check without dropping the tank?

 

[Scottydoggs]

check for fuel pressure at the fuel rail on the engine key to run. if theres no pressure theres no working pump. check for a blown fuse too.

 

[YukonandtheHOE]

Fuel pumps can just quit. Try hitting the bottom of the fuel tank to jar the pump into pumping again. Then burn the gas up and change the pump.

 

[swathdiver]

A good scan tool like the Tech2 will tell you in mere moments what is wrong.

 

[lkrasner]

check for fuel pressure at the fuel rail on the engine key to run. if theres no pressure theres no working pump. check for a blown fuse too.

Where is the fuel pump fuse? I didn't see it on any of the diagrams ..

 

[lkrasner]

A good scan tool like the Tech2 will tell you in mere moments what is wrong.

How? I have a scan tool capable of basic obdii , might be able to borrow something. What exactly do I need to read? I know the pump is not running, but I'd like to be able to test the power to it without dropping the tank.

 

[Scottydoggs]

Where is the fuel pump fuse? I didn't see it on any of the diagrams ..

im not really sure, generally theres one for it. might not say fuel pump. might have an abbreviation listed.

 

[lkrasner]

Is there any way the anti-theft system could disable the pump? From what I remember it just disables the injectors.

 

[swathdiver]

A Tech2 can command the pump and off and see how much power is getting to it and such and of course, read those internal codes that basic readers cannot.

 

[Fless]

Where is the fuel pump fuse? I didn't see it on any of the diagrams ..

@lkrasner, if your underhood fusebox looks like this one, it's right next to the fuel pump relay. PCM B.

 

[lkrasner]

im not really sure, generally theres one for it. might not say fuel pump. might have an abbreviation listed.

Rhys

@lkrasner, if your underhood fusebox looks like this one, it's right next to the fuel pump relay. PCM B.

View attachment 192652

It's not quite that. I'll take a look later, I don't remember seeing any PCM fuses. There were a couple ECM ones, and I checked all those. I've got another vehicle I can drive for now. Planning on waiting till it warms up then I'll get the tank down and investigate. It has come down recently, so it shouldn't be too horrible. Of course I had e85 in it, so I can't even burn it off in something else...

 

[Fless]

From the 2002 Tahoe Suburban Owner's Manual:

 

[lkrasner]

From the 2002 Tahoe Suburban Owner's Manual:

View attachment 192717
View attachment 192718

Ah, didn't even think about the manual, good to know that breakdown is in there... Sadly that fuse is good. Looks like it's time to check out the pump. I'm thinking about cutting an access panel and doing it from the top