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Old 10-06-2008, 07:11 PM   #1
2subs
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'99 Suburban extremely hard on fuel pumps

Howdy, new member here, I'm beside myself with anger tonight.
1999 K1500 Sub, 186K, Runs great when it runs.

I replaced the fuel pump and sender last December with Delco
parts, and it quit working again mid-August. Drained tank and
replaced again with Delco. Here it is the sixth of October,
I get home from work, and my wife tells me that the truck
won't start again. How can two pumps go bad in such a short
amount of time?

I've done all the work myself, the job isn't too bad, the worst part
is draining the tank. Where are all the grounds located. I have a feeling
that something else is afoot here. Did I miss something?

I also have the telltale dancing fuel needle. Is this a ground issue,
or a sender, or both. Any guidance would be greatly appreciated.

Scott
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Old 10-07-2008, 10:14 AM   #2
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Re: '99 Suburban extremely hard on fuel pumps

Wiring and plugin and power and grounds are very importain.
What is failing on the old pumps?

When no start check for 12 volt power and good ground at the wires going to pump.
Have they been run low on fuel in tank?
Dirty fuel or stopped up fuel filter?
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Old 10-07-2008, 01:20 PM   #3
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Re: '99 Suburban extremely hard on fuel pumps

MT,

Thanks for the reply. I'll have to drain again, and check for power
back there. I can't say that I know for sure that the pumps have
failed, I'm just guessing. I get no sign or sound that anything is
alive back there.

Would a bad pressure regulator wear a pump out prematurely?
Does anyone have a schematic of where all the grounds are located?

What drives me nuts is that my '99 5.7 K2500 Sub has no wavy fuel needle, and starts without hesitation.

Let me know if anyone else has bumped into anything unusual. If the pumps keep going out at this rate, I'll have GM back on their feet in no time.

Scott
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Old 10-07-2008, 02:39 PM   #4
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Re: '99 Suburban extremely hard on fuel pumps

Are you running the tank low of fuel?
Dirty fuel or stopped up fuel filter?

Fuel pump ground is inside left frame rail near front of transmission.
Relay ground is right rear cylinder head.

Fist check voltage and ground and wires before the get to tank.

Pumps are made to run under normal pressure all time.
Running at high pressure.
Running low of fuel.
Low voltage.
Restricted system and dirty fuel.
Will kill Them dead.
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Old 10-07-2008, 07:11 PM   #5
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Re: '99 Suburban extremely hard on fuel pumps

MT,

I changed the fuel filter last December with a Wix unit. I rarely let
the tank get below 1/2 full because of the gas keeping the pump
cool. I don't know if I have a dirty fuel system, but I don't buy gas
anywhere but "name brand" stations I guess.

Where do I check power to the pump without dropping the tank?

I will check all grounds also. I wonder if the jumpy fuel gauge is indicative
of the pump working too hard to keep pressure, like it's fighting a bad
pressure regulator. I'll keep narrowing down options.

Scott
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Old 10-07-2008, 07:24 PM   #6
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Re: '99 Suburban extremely hard on fuel pumps

Quote:
Originally Posted by 2subs
MT,

I changed the fuel filter last December with a Wix unit. I rarely let
the tank get below 1/2 full because of the gas keeping the pump
cool. I don't know if I have a dirty fuel system, but I don't buy gas
anywhere but "name brand" stations I guess.

Where do I check power to the pump without dropping the tank?

I will check all grounds also. I wonder if the jumpy fuel gauge is indicative
of the pump working too hard to keep pressure, like it's fighting a bad
pressure regulator. I'll keep narrowing down options.

Scott

whenever replacing a fuel pump the pump relay should be replaced or opened and inspected for contacts being burned...


on your needle, fuel gauge ...is it wondering or vibrating ? If it vibrates rapidly this is usually the dash console...but could be grounds that look good but have to be removed sanded to bright metal and then re attached....



after the fuel pump is replaced check fuel pressure....this will give info on what maybe causing the pump to fail...
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Old 10-07-2008, 08:18 PM   #7
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Re: '99 Suburban extremely hard on fuel pumps

J cAT,

The needle is vibrating. I couldn't find the ground on the drivers
side near the front of the transmission but I'll keep looking. I found
all kinds of grounds at the rear of the motor on the passenger side.

I'll check fuel pressure after I replace the pump again. All grounds that
I can locate will be cleaned up. I'll replace the relay, and probably
the pressure regulator while it's all apart. It's too nice of a truck to give
up on just yet, but I'll admit I'm frustrated.

Scott
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Old 10-08-2008, 09:10 AM   #8
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Re: '99 Suburban extremely hard on fuel pumps

Quote:
Originally Posted by 2subs
J cAT,

The needle is vibrating. I couldn't find the ground on the drivers
side near the front of the transmission but I'll keep looking. I found
all kinds of grounds at the rear of the motor on the passenger side.

I'll check fuel pressure after I replace the pump again. All grounds that
I can locate will be cleaned up. I'll replace the relay, and probably
the pressure regulator while it's all apart. It's too nice of a truck to give
up on just yet, but I'll admit I'm frustrated.

Scott
Clean and check all grounds.
Also you can run a extra ground on it.

But on your main problem of hard to start always test it out when hard to start.
Could be other ptroblems besides fuel pump or fuel pressure.
Remember proper testing is first thing to do.
Good luck
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Old 10-19-2008, 05:08 PM   #9
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Re: '99 Suburban extremely hard on fuel pumps

Update:

Well, I cleaned up, and rewired the pump ground that runs to the crossmember just in front of the tank. The fuel pump runs again, but
it is throwing a SES that I need to pull.

I hope that's all it was, I have read some past posts where this was the
problem. I hope it continues to run, and I will pull the code and see what's
bugging the ECM.

Scott
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Old 10-19-2008, 06:47 PM   #10
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Re: '99 Suburban extremely hard on fuel pumps

Quote:
Originally Posted by 2subs
Update:

Well, I cleaned up, and rewired the pump ground that runs to the crossmember just in front of the tank. The fuel pump runs again, but
it is throwing a SES that I need to pull.

I hope that's all it was, I have read some past posts where this was the
problem. I hope it continues to run, and I will pull the code and see what's
bugging the ECM.

Scott
Not only in in past post but in this post check the ground was metioned several times,
Thanks for posting back how it went
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Old 10-19-2008, 08:25 PM   #11
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Re: '99 Suburban extremely hard on fuel pumps

If your '99 is an OBS (Old Body Style) (looks like a '95) I may be able to add some tips.

If it's an NBS (New Body Style) (looks like a '00) I'm out.
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Old 10-19-2008, 08:32 PM   #12
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Re: '99 Suburban extremely hard on fuel pumps

MT,

I appreciate the heads up on the grounds. I'm upset at myself for
probably tossing out a perfectly good AC/Delco pump back in
August.

777,

I have the 1999 OBS, last year I believe of the larger Subs. I'll take any
hints and pointers I can get.

Scott
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Old 10-20-2008, 10:29 AM   #13
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Re: '99 Suburban extremely hard on fuel pumps

Quote:
Originally Posted by 2subs
MT,

I appreciate the heads up on the grounds. I'm upset at myself for
probably tossing out a perfectly good AC/Delco pump back in
August.

777,

I have the 1999 OBS, last year I believe of the larger Subs. I'll take any
hints and pointers I can get.

Scott

what about that rapidly vibrating fuel gauge????
Did the ground cleaning solve that problem to...? the needle problem has had some give up on repairing..
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Old 10-20-2008, 07:32 PM   #14
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Re: '99 Suburban extremely hard on fuel pumps

j cAT,

Nope, didn't cure the dancing needle. I'm going to check all grounds
under the dash, and see what I come up with. Time to go to Helms
and get the proper FSM. Nice to know where all the grounds and wiring
run.

Scott
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Old 10-21-2008, 11:09 AM   #15
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Re: '99 Suburban extremely hard on fuel pumps

Quote:
Originally Posted by 2subs
j cAT,

Nope, didn't cure the dancing needle. I'm going to check all grounds
under the dash, and see what I come up with. Time to go to Helms
and get the proper FSM. Nice to know where all the grounds and wiring
run.

Scott
the dash instrument panel is most likely causing this....as others have also found this to cause their problem...

grounds and conectors in the area..
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