How to replace your fuel pump

[maxim9691]

Nice guide- had a local shop replace mine for $400 and after reading this I feel better about the cost.

 

[99Yukon4x4]

Good write up, but question for anyone. I just did mine (2nd time in a GM product), and got the old one out, and put the new one it, got the wiring harness figured out. Now, I went and put gas in it, and found that it would really not go past 1/4 tank. I pulled the pump again (I had cut an access hole in the floor board, since my bolts and straps were not being friendly), and my tank was damn near full. I have a 4 door 4x4 Yukon SLT, could I have gotten either a bad fuel pump, or the incorrect one?

Thanks!

 

[ajaxnxs]

Had mine replaced today

Sent from my SAMSUNG-SGH-I727 using Tapatalk

 

[99Yukon4x4]

After getting the wiring schematic for the original plug (square), and going over the new plug harness, it is not as easy as going A to A, B to B, C to C, and D to D. Mine was color coded to match both harness's. I did it the above way, and it thru a check engine code, and with a full tank, it was reading 1/4 or less. Switched wires, and engine code went away, and fuel level went accurate. Not sure if it is the same with all units, but this is how it worked for me.

 

[xanatost]

When I did mine I put an external pump on mine. If it goes out again then I don't have to drop the tank. On my old truck it took me about 15 mins to chance it out when it went out for the 2nd time. Just an idea for those who are keeping there for a long long time.

 

[rocky]

When I did mine I put an external pump on mine. If it goes out again then I don't have to drop the tank. On my old truck it took me about 15 mins to chance it out when it went out for the 2nd time. Just an idea for those who are keeping there for a long long time.

Great idea!
Can you post pics and part #'s?

 

[gc_mountainman]

When I did mine I put an external pump on mine. If it goes out again then I don't have to drop the tank. On my old truck it took me about 15 mins to chance it out when it went out for the 2nd time. Just an idea for those who are keeping there for a long long time.

xanatost,

Ditto. Would you please post the make and model of the external fuel pump and any pic's would be great.

It is the long weekend here in the bush of Central BC and the parts stores will be closed til Tuesday, lol. Damn my luck. But it looks like a new fuel pump is in my future.

RAVINGMADMAN,

Thanks for this information. I hope after I get the new relay in my Hoe will fire up straight away. Hopelessly, optimistic!

Thanks all,

Mountainman.

 

[gc_mountainman]

Well halfway there. The fuel tank and pump are out, just waiting for the pump to arrive in the morning.

Any opinions on the brand of pump to put back in?? I have gone with an AC Delco, but looked for a Bosch as well.

The guidance from Ravingmadman has helped alot. Maybe I need one more sanity check before tackling the re-assembly.

Mountainman.

 

[SunlitComet]

delco or delphi only. and the new improved design as well.

 

[gc_mountainman]

Ravingmadman,

Thanks again.

Mountainman.

 

[m1n3r]

couple differences from the 4 door and 2 door so far. Im at the point where i have the straps holding the tank completely off and the tank wont budge. I felt all around it and there is a big sticky seal on the front end of the tank. I loosened that my best. Im literally hanging on the tank and its not budging. I cant find any more bolts. Now im talking to myself. maybe its the gas i inhailed lol.

 

[crueeldude13]

Hi folks long time lurker here. Finally doing major repairs to my yukon, crate engine, tires, wheels etc. I think I'm about to have to tackle this as well. When long idling or long trips around town my fuel pump starts a loud hum. I have a 1997 gmc yukon 4dr slt 4x4 5.7. I want to use oem parts, the only thing I can come up with is acdelco mu1609. Can anyone confirm? Also has anyone had any luck with an external fuel pump upgrade or can anyone post a link or pics to show where to cut the floor for an access panel in the 4dr models?
Thanks!

 

[pvaldeben]

smell gas in rear driver side tire.....

Been smelling fuel for about 2 weeks and finally took a look at the under carriage. No fuel drips but I saw fuel sweat that was damp to touch under the gas tank.

The Tahoe does not have any issues with the fuel pump just that it leaks.

Hope its just a fuel pump gas kit that can be replaced easily.

I have to fix it since i'm sure its dangerous.

Please let me know if anyone has tips for someone familiar with my situation.

 

[SunlitComet]

drain the tank safely as quickly as possible and drop it for inspection.

 

[ccapehartusarmyINF.(ret)]

i know this goes without saying but ill say it anyway because ive seen a couple knuckle heads nearly do it when i was at UTI
make sure you run the gas tank dry before hand or siphon it out whatever

 

[SunlitComet]

you can maybe rig up a pressure test fitting with a hose long enough to feed the tank of another car or two. will also need a relay by-passer to run the pump of battery till near empty. running the engine to do it may not work as the pressure drop out the port might let the injectors not have any to use. there is supposed to be a one wire connector in the bundle that feeds power to pump that factory uses to prime the entire system before first start.

 

[Holt50]

Does anyone know what the difference is between the fuel pump (complete unit) for a 2dr and a 4dr? No one seems to have the 2dr pump assemblies in stock, wonder how different they are...

I think I just put on a2door pump in my 4 door. Works fine

 

[Holt50]

Pulls yours out and go down to the parts store and see about comparing them side to side ... or you can just replace the pump part.

That's what I did I just replaced the pump