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Old 10-24-2011, 09:19 PM   eBay Motors  #1 (permalink)
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losing prime problem

I've been losing prime below a quarter of a tank. So I rebuilt the filter head and it was all fine. I also installed a lift pump and put in a new fuel filter. The problem continues to happen, but only below a quarter of a tank. I can get it to run if i reprime the system and the low fuel light does not come on. I can go about 2.5 miles before it does it all over again. I dont have any fuel leaks because i would've found them by now. I get a p0087 and p1093. Both are low fuel rail pressure. I am at a loss. I haven't found any threads on this. Anybody have suggestions or experience with this problem. Do I need to rebuild the frpv or install a shim? Would the fprv effect my mileage, too? Because I am getting horrible mileage (14mpg).
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Old 10-27-2011, 01:06 PM   eBay Motors  #2 (permalink)
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I am have had the same problem also but noe mine now does it if the truck sits for more then 8 hours or so without running and with or without low fuel. I actually got on here to see if i could find some insight into this problem. Let me know if you come up with anything and ill do the same.
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Old 10-27-2011, 01:28 PM   eBay Motors  #3 (permalink)
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I had a prime loss and it was the high pressure fuel sensor in the valley. Rebuilt fuel filter housing and blah blah blah and finally fixed it after the damn thing blew out and shot fuel all over the place!
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Old 10-28-2011, 07:25 AM   eBay Motors  #4 (permalink)
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Quote:
Originally Posted by Skierbum View Post
I get a p0087 and p1093. Both are low fuel rail pressure. I am at a loss. I haven't found any threads on this. Anybody have suggestions or experience with this problem. Do I need to rebuild the frpv or install a shim? Would the fprv effect my mileage, too? Because I am getting horrible mileage (14mpg).
When my truck started to act up I thought it was lossing it's prime also. Each time I reprimed it it seems to be OK. So I rebuilt the fuel prime pump (o-ring kit). Then it ran fine for awhile. To make a looong story short it ended up being the FPRV. Do the bottle test, this will tell you if it is your FPRV. It's a simple test that takes about 10 minutes to set up.

I also had the same codes as you have. Do the bottle test!
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Old 10-28-2011, 08:48 AM   eBay Motors  #5 (permalink)
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Sorry to hear about the issues! If you private message me with your VIN, we can look further into the situations.

Thank you!

Joey, GM Customer Service
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Old 10-28-2011, 10:02 AM   eBay Motors  #6 (permalink)
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yeah try the bottle test.. i was pulling up the same codes and my truck went into limp mode. I bought the shim kit from the dmax store and my truck runs good now, not too sure if this is the problem but its a easy fix!
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Old 10-28-2011, 10:40 AM   eBay Motors  #7 (permalink)
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look at the bleeder screw on top of filter housing they are plastic and if tightened to much they will crack mine did the exact same thing i bought a new bleeder screw and problem was solved
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Old 10-28-2011, 10:44 AM   eBay Motors  #8 (permalink)
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^ mine just did the same thing
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Old 12-12-2011, 08:50 PM   eBay Motors  #9 (permalink)
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sorry to sound like a noob but what is the bottle test and how do i do it?
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05 lly crewcab short flatbed 4x4 stock except for a 5in straight pipe, edge evo race, and a sinister egr delete.

06 ext cab 2wd drw 462,xxx, New motor with 5k, 3.5 inch downpipe to 4inch straight pipe, 19.5s, Custom towbody, Efi live from www.powerlabsdiesel.com, built tranny, egr delete, airbags, and Edge insight.

Thanks to Gary at diesel pros in Bozeman, MT
Cam at Adrenaline Performance in Shelley, ID
and the guys at powerlabs for tuning.
http://www.Alligatorperformance.com/
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Old 12-13-2011, 03:34 PM   eBay Motors  #10 (permalink)
 
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Just my own 2 cents worth. I had the same exact problem as you did for the last 3 months. This is what I did:
1. Replaced fuel filter housing (brand new housing) - No fix.

2. Replaced rubber fuel lines from housing to FICM - No fix.

3. Found could not attain and hold fuel pressure above 21k psi. Replaced fuel injection pump - could attain full fuel rail pressure but still loose prime over time and hard start. - No fix

4. Finally lifted the bed to find a SEVERELY rusted fuel tank sending unit. Replaced sending unit, fuel cooler, and lines to underneath front door.

FIXED!

Trucks starts on one revolution like it used to and has all kinds of power again.

Noticed your signature picture has snow in it - might be worth a peek at the sending unit....
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