Jump to content

No fuel pressure on my 08 sierra

Paul Kalstek
 Share

Recommended Posts

Paul Kalstek New Member

Paul Kalstek

Posted
Posted

The truck wouldn’t start one day with no previous problems other that a tps issue (which I replaced ) talked to a few ppl and they all said bad fuel pump .i checked the relay (heard it click) I checked the ground on the pump  and that was ok . Replaced the pump and still a no start condition with zero pressure .  I originally suspected a fuel pressure regulator . Any ideas ??

Mike GMC Enthusiast

Mike GMC

Posted
Posted

I believe the regulator is part of the pump assembly in 08.  Did you replace the whole thing, or did you replace the pump in the old assembly?  What are you getting for pressure at th rail?

Mike GMC Enthusiast

Mike GMC

Posted
Posted

What happens if you disconnect the fuel line from the rail and turn the key to on to start the pump?  If no fuel come out, you may have a clogged fuel line.  If fuel does come out, you may just have been air locked.

carnau Enthusiast

carnau

Posted
Posted

Your pump is probably controlled by the FPCM (fuel pump control module). Have run into this many times. Do you have any codes in the vehicle?

Here is the Schematic. A little more testing needs to be done but I am betting on a bad FPCM if you replaced the FP and it still has no pressure.

 

Here is the link to the module. - http://amzn.to/2Ep91zH

 

 

 

Capture.JPG.a73a228707e13c7b89051e2a5bad59d0.JPG

bubbanbrenda Enthusiast

bubbanbrenda

Posted
Posted
8 hours ago, Mike GMC said:

If the fpcm is bad, would he hear the pump run with key on?

Yes, my fpcm quit, I could here the pump running, but no start, replaced it and had to have it programmed at a dealer. Also had a check engine light when mine quit, don't remember the code off the top of my head.

SpartanAutoworx Enthusiast

SpartanAutoworx

Posted
Posted

P069e most common code for bad FSCM.

 

New ones must be programmed to work. 

 

Before replacement you need to check a few wires at the FSCM for proper power. The green and white wire is common for breaking along with a bad pcm. Diagnosis is key before spending any hard earned money for parts that might not fix the problem at hand.

 

get on YouTube and you will find a few good vids on properly diagnosing the FSCM. 

  • Like 1
carnau Enthusiast

carnau

Posted
Posted (edited)
19 hours ago, SpartanAutoworx said:

Also 20759945  The part number for 2007 08 and 09 vehicles is on national backorder right now. 

Agreed. But you can buy them on Amazon no problem! lol

http://amzn.to/2Ep91zH

Edited by carnau
  • 1 year later...
Charles Potter New Member

Charles Potter

Posted
Posted
On 2/11/2018 at 5:34 PM, Paul Kalstek said:

The truck wouldn’t start one day with no previous problems other that a tps issue (which I replaced ) talked to a few ppl and they all said bad fuel pump .i checked the relay (heard it click) I checked the ground on the pump  and that was ok . Replaced the pump and still a no start condition with zero pressure .  I originally suspected a fuel pressure regulator . Any ideas ??

Did you ever figure out the problem?

  • 2 years later...
Tim sliman New Member

Tim sliman

Posted
Posted

I’ve replaced fpcm fuel pump all new lines rails had new fpcm programed and now it only runs for three seconds then dies Ik fuel pump is good if I jump the power and ground from the plug for the fpcm to the power and ground for fuel pump truck runs but I have no power to the fuel pump fuse at all nothing I do I’ve trued back feeding power through the fuse nothing is working 

 

 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Buckwild27
      Gas Prices

      By Buckwild27 · Posted

      I agree. 
    • Atlas
      Gas Prices

      By Atlas · Posted

      87 down as low as $5.14 here... winning!
    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      Progress... sort of.   Intake is disassembled, spider is out, fuel lines removed. Used a torch on the stripped screw with the lower intake off, much easier when I've got the intake sitting on my workbench, I made it talk. Walked right out with a pair of vice grips once it was nice and toasty hot.   New parts are piling up on my service cart waiting to be installed. Distributor, temperature sensor, new gaskets, fuel line kit, themostat, water neck.   My new pickle is I don't want to spend $600 on a replacement spider. I'm not sure IT is bad. I'm probably splitting hairs. Or it's $300 to send mine away and another 3 weeks of the truck just sitting. I have half a mind to assemble everything with the old spider to see if I can get away with just replacing the fuel pressure regulator to be safe. The obvious issue was the gushing high pressure fuel line which will be replaced. Getting to the spider really isn't that hard, and now I know what I'm doing , swapping it would be a breeze should it absolutely need one. Stupid, or smart?   The part that gives me pause is replacing the distributor. Well, it's already out. And I didn't mark it, whoopsie! Engine was at TDC when I removed it, I know that, so upon correct reinstall the metal tip on the rotor should point to the TDC mark on the distributor because that's where it was pointing on the old distributor. Worst case I'm a tooth off and have to re-stab it.   But then, what? I assume the truck will start. It doesn't appear the timing can be set. Here's the problem: These distributors can't be rotated but a degree or two, by design. What I read is Cam ****** needs to be -2 to +2 degrees, ideally at 0 (and checked/set above 1000 rpm). There should be enough wiggle to get that properly set, but checking the reported value is another potential issue. My Actron 9185 scanner says it supports enhanced GM PIDs and Cam ****** is one of them but it's unclear that I'll be able to correctly see it over OBD 1.5. I can see why people end up junking these things with life left in them. They're an absolute nightmare with tweener-year diagnostics/electronics and unobtanium parts.   Fingers crossed it starts and idles nicely. There can be hope, right? I'ma buy a lottery ticket the same day just in case.   Next steps..DO IT. I have not installed an intake before so I've been reading and watching a lot. Some say NO RTV except on china walls, some say DO RTV on water ports but not fuel/air intake. 1/4 or 3/8 bead on China walls? I think my strategy will be, obviously, RTV china walls with overlap on the gasket corners. Chapstick-style RTV the water ports. Leave intake ports dry. The only set of intake gaskets I could find locally are Edelbrock performance gaskets (uh...for an asthmatic 190hp V6? LOL) so we'll see how they do.   #NoToolLeftBehind. It took an hour, but my recovery mission for my deep 10mm socket was successful. It had rolled down the bellhousing and wedged itself between what I think are the fuel lines? I couldn't see it at all, but with a junk antenna I had laying around, I blindly went poking/sweeping for it, heard it clink, raised the truck, and caught a sliver glimpse of chrome with a flashlight way up there in Narnia. I had pushed it farther along the lines holding it captive, but within access of severely improvised tools, poking and cursing at it to finally knock it free to where I could get a fingertip on it to bring it home.    Not much to see.      
    • RyanbabZ71
      Gas Prices

      By RyanbabZ71 · Posted

      Thats crazy considering im right next door (Indiana)
    • Black02Silverado
      New Retail & Commercial Promo

      By Black02Silverado · Posted

      For a limited time, retail and commercial accounts receive an AMSOIL Vinyl Tool Tray with their order of $500 or more when they use code TRAY726 at checkout. The promotion runs through July 21, 2026.   Order at https://syntheticadvantage.com   Want to use AMSOIL in your business or sell at your store, apply here.  https://www.amsoil.com/business-opportunities/?zo=521390  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...