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Cranks but wont start. Fuel problem?

fuel pump died? will not start but cranks.

Cranks but wont start. Fuel problem?

Postby heelsparky0501 [OP] » Sep 29 2011, 1:23pm

Well i hopped in my truck this morning to go to work, everything was normal. I started it up and let it idle for a second or two and then right when i was about to put it in reverse it just died like someone flipped a switch to kill it.

Continuous cranking would not start it so i hopped out and popped the hood.

I swapped the fuel pump relay with another one - Still didnt start
Checked fuses - Still didnt start (fuses looked good)
Checked the fuel pressure - Nada, nothing. No reading when the key is in the on position or while cranking. I also didnt hear it buzz when its supposed to be priming.

So my assumption is that its the fuel pump. The gas guage has been goin nuts for about a year and i was going to replace the sending unit soon.

It was raining pretty hard yesturday and there was a lot of water on the roads, could that have anything to do with the pump dying? The truck is lowered 4 in the front and 6 in the rear.

Im guessing the only reason it started was from the pressure built up yesturday right?
The fuel pressure regulator wouldnt have anything to do with this would it?

Thanks in advance for the help.

Engine is a 4.8 in a 99 nbs sierra 1500
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heelsparky0501
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Related Topics  1997 chevy 1500 cranks wont start   Fuel problem / Won't start after sitting   truck cranks, no immediate start   98 Silverado cranks but will not start   5.7 runs great-but..takes more cranks to start?   cranks, won't start & no dash lights   2002 GMC 5.3L STARTS cold. cranks cranks if motor was hot   4.3 wont start   Truck wont start   2013 5.3 wont start   truck wont start   Truck Wont Start   HELP Silverado Wont Start   truck wont start 
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Re: Cranks but wont start. Fuel problem?

Postby CountryBoy12 » Sep 29 2011, 1:58pm

get a rubber headed hammer and have 1 person crank the motor and another bang on the fuel tank. Most of the time it will work to get it started thats when u know its the fuel pump. It may not work though and it still could be that. And also when you turn the ignition on have someone put there head down by the tank and see if they can hear the fuel pump. Worth a shot.
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Re: Cranks but wont start. Fuel problem?

Postby heelsparky0501 [OP] » Sep 29 2011, 2:17pm

Thanks for the advice, I'll give it a shot when I get home.

If it is the pump I imagine I would need to take the bed off right? Since I can't drop the tank because my truck is lowered.
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Re: Cranks but wont start. Fuel problem?

Postby CountryBoy12 » Sep 29 2011, 2:35pm

yes unless you can get your hands on a lift and drop it out that would be much easier. If its the first time its been changed it will prob be a bit a of a job. Especially if you drop it and u have a lot in the tank. And when your removing the actual pump be real careful nothing falls inside or u will have bigger problems.
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Re: Cranks but wont start. Fuel problem?

Postby lilmagoo1 » Sep 29 2011, 2:57pm

i used a motor cycle jack to lower my tank, worked perfect. also to check to see if its the fuel pump spray some gas down the throttle body and see if she will start. i had a 98 and the fuel pump only pushed out 50 psi when it needed 58 to start if i didnt give it fuel to start it would just sit there and crank until i killed the battery. but once i got it started it kept enough pressure to stay running. so until i changed the fuel pump i took off my intake hose from the throttle body sprayed some gas down the throat and started it up. just thinking try it to see if that will get it to start at least this way you know your problem is 100% not getting fuel also change the fuel filter make sure its not clogged... also just a word of advice i changed my fuel pump 3 times, i bought one from advanced auto with a 2 year warranty, just do it right and get the one direct from gm and save yourself the time and aggrevation.
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Re: Cranks but wont start. Fuel problem?

Postby heelsparky0501 [OP] » Sep 29 2011, 5:06pm

Yea I just filled the tank up the other day.

I'm not sure if the motorcycle jack will work (I do have one) because of my truck being lowered. And I do have a lift but I didn't set it up yet. Great timing :)

I'll probably end up taking the bed off and seeing if the pump is getting power first then change it that way.

I'll try the gas down the intake truck first though.

Thanks for the help so far everyone.
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Re: Cranks but wont start. Fuel problem?

Postby heelsparky0501 [OP] » Sep 29 2011, 8:19pm

Ok, not sure what exactly I did but I played with the fuses and now it starts.

I was reading on another forum that the correct fuel Pressure with it running is between 55 and 62 psi is this right?

When it is running I get about 46 48 psi. Now when I take the vaccume line off the fuel pressure regulator i get 58 psi. Could the regulator be bad or do you guys think the pump is still bad/cause of the low psi. (no gas came out of the regulator)
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Re: Cranks but wont start. Fuel problem?

Postby lilmagoo1 » Sep 29 2011, 9:07pm

sounds about right but it requires 62 pounds to start the vehicle and 55 psi to run the vehicle. thats what my problem was it would only push 55 psi when trying to start and stay there when running. but if its starting on its own it could be the regulator, try the cheapest route first its going to be trial and error brother.
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: 18" MBmotoring V-drive rims W/ 00 offset :
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Re: Cranks but wont start. Fuel problem?

Postby heelsparky0501 [OP] » Oct 05 2011, 10:36am

Ok, so I ended up getting it working but in a weird way.

I pulled the fuse labeled ECM and put it back in and bam, starts right up and I can hear the fuel pump.

This worked for a few days but then it happened again and to get to work this Koenig I needed to pull the same fuse and put it back in

Also when I put it back in I see a small blue arc.
Any idea what can be causing this?
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Firing on 4 cylinders [L1]
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Re: Cranks but wont start. Fuel problem?

Postby lilmagoo1 » Oct 05 2011, 12:54pm

bad wiring? bad fuse box? there could be alot of things happening to that fuse if its loosing power
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: 07.5 Silverado : 3"lift & 1.25" body lift : 295/70R18 Trail Grapplers :
: 18" MBmotoring V-drive rims W/ 00 offset :
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