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Need Fuel System Help ASAP...

MacADaYear

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MacADaYear Enthusiast

MacADaYear

Posted
Posted

First off its a 00 Sierra 4.8 2wd.... SCSB....

 

Today I went out to start the truck and she start up. I can turn her over but I think shes not gettin fuel.

 

I noticed that the fuel pump wasnt priming when I turned the ignition to ON... so I started checking fuses and the fuel prime check. The price check wasnt lighting up with the test light and then I found that the ECM2 fuse was blown. So I changed that and then the truck would start but if I pushed the gas it would die. Basically it would only idle and it was struggling at that....

 

So now it kinda starts... still doesnt prime the fuel pump... and dies when any gas is givin.

 

Help me out guys... Im thinking its the fuel pump but I dont wanna go buy one untill I know... I cant see what else it would be.

 

If it is the fuel pump am I lookn at mucho $$$ to get her fixed? I can replace it myself I think but are the parts expensive?

 

Any ANY help would be appreciated....

Chris97K1500 Enthusiast

Chris97K1500

Posted
Posted

Since you were able to get it started, I just don't think it would be a fuel pump problem. I could be wrong, but every fuel pump I've seen go out, usually just completely dies, nothing in between. If it ends up being a fuel pump, they are not fun to replace, but can be done by almost anyone if you've got time, tools, and a little mechanical intuition. It will be very heavy if there is gas in the tank, so I'd recommend getting a floor jack to help you lower it down. You will have to drop the tank. That's the hard part, putting in the new one is easy. I put one in a friend's Dodge the other day, cost him about 200$ or so for the pump. But again, it doesn't sound like your problem is a pump, IMO. Do you have a strong smell of gas coming out of the exhaust pipe when it is idling? I'm sure someone here knows more than I do, hopefully they will chime in here! Good luck, Chris

ridnlow Enthusiast

ridnlow

Posted
Posted

I tried to look up the fuel pump on gmpartsdirect.com and it looks like anywhere form 250-300 for the fuel pump. My mom had her replaced by the dealer a while back for 700... so they will take you on that. Best thing to do would be buy one online and do it yourself. My friend has a 2001 4.8 and it would do what you are talking about.. it would crank and idle but when you hit the gas it would die.. so he would just get in it and stab it for about 15 seconds and it worked fine after that..

MacADaYear Enthusiast

MacADaYear

Posted
  • Author
Posted

Oh man Im really lost now....

 

So this morn I spent some time readin my Chiltons book and was pretty set on having to drop the gas tank and replace the fuel pump...

 

But then I figure Ill try to turn her over for the hell of it....

 

So... ofcourse... she starts right up like nothing happened.....

 

Run fine . Idles Fine... my WOT runs seem the same... so im guessing its getting all the fuel thats need.....

 

So whats goin on here guys? I dont get it...

One thing I was thinkin is maybe someone the pump overheated and blew my ECM2 fuse... which I replaced... then maybe I should have reset the computer.

 

I still wanna find out what was wrong so I dont end up stuck agian.

Chris97K1500 Enthusiast

Chris97K1500

Posted
Posted

Just an idea, if you haven't disconnected your battery and reset the computer, maybe you should take your truck to AutoZone and get them to run a free diagnosis test, only takes a couple seconds. It could have thrown a code that can help you solve your problem. I don't know, just a suggestion. If it runs fine now, seems like it may be an electrical problem? Again, just a guess. Chris

Chris97K1500 Enthusiast

Chris97K1500

Posted
Posted

Yeah, just tell them you think you have a problem with your truck and that you'd like them to run a diagnosis on your truck. It looks like a handheld tuner (HPIII), plugs into your diagnosis port and scans the computer. If there's a problem, it will show the code #, if not, it will say No Codes or something like that. Took about a minute on my truck. The port for my truck is under the dash on the driver's side. Looks like the port your Monitor plugs into on your PC. I'd imagine your's is similar. Chris

MacADaYear Enthusiast

MacADaYear

Posted
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Posted

I was just there and they didnt have the OBDIII scanner. I guess they have the ones for the OBDII, but once the guy started telln me to hookup a jumper wire and count the flashes I knew it was time to leave....

 

That might be for the OBDII but ive never heard of that for NBS trucks.

 

My pump is making werid sounds so im thinking its on its last legs.

ridnlow Enthusiast

ridnlow

Posted
Posted

I believe the jumper thing only works for pre 96.. I went to autozone and they have a scanner that hooks into the same place that a programmer would.. under the steering wheel that gives them the code and resets it.. Then they take the code inside and look it up on their computer and tell you what it is.. In my case my bank 2 sensor was running lean so i just got into some bad gas.. My fuel pump used to whine real loud.. and i started running Amsoil Performance Improver and it doesnt whine anymore.. just giving you ideas.. would be a lot better spending that 12 bucks than 300...

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