Chevy and GMC Duramax Diesel Forum banner
  • Hey Everyone! Enter your ride HERE to be a part of this months Ride of the Month Challenge!
1 - 7 of 7 Posts

·
Registered
Joined
·
5 Posts
Discussion Starter · #1 ·
HELP!!! Hey guys i have a 07 Silverado LBZ CCSB 4x4 with 270k miles. This is my first diesel and i have had it for about 2 years and love it. I have Fass fuel system lift pump, S&B cold air, EGR Delete, Turbo back 5" exhaust and factory fuel filter delete and fuel rail pressure plug. Mind you all this was done to truck when i got the truck but i love it. Runs great until recent, when i get the truck under a load like pulling our 5th wheel camper i get a p0087 but i can clear and will be good for a while. I sometimes can smell fuel under the hood so i checked the torque on the fuel rail plug and i noticed what looked like a fuel service port next to the alternator and pulled the black plastic cover and it has fuel in it and would have air bubbles when it was running. So thinking this might be the problem cause if air can get in could cause the issue. I ordered a replacement one and it came in yesterday so after church today pulled it in the shop thinking since it was right there on top of the engine that it was something that would be easy to replace, so i tried backing the old one off real easy and it snapped. I am aggravated but i went ahead and got the fuel line that the connector was on off the engine. Guys i dont even know where to start with fixing this line if it can be fixed or what the name of this line is called to order. Can someone help me with this???
 

Attachments

·
Premium Member
Joined
·
9,089 Posts
Is that the line running from the fuel filter over to the injection pump?


Sent from my iPhone using Tapatalk
 

·
Premium Member
Joined
·
26,484 Posts
I'm confused. 'dunno;
By the alternator, black cap, oozing fuel....that's a pressure test port on the fuel supply line, between the fuel filter (which you say is missing) and the CP.

But if you have a lift pump with positive pressure (assuming it's actually working/pumping), there shouldn't be air bubbles with the engine running, with that test port schrader valve leaking.

Filter delete, how was it bypassed? Is your LP dead?

Now the pic posted....4 nipples in a row, that's the injector(s) fuel return line.
Not the supply line with the schrader valve.

In trying to remove the supply line, did you break the fuel return instead?
 

·
Registered
Joined
·
5 Posts
Discussion Starter · #4 ·
I broke the test port off, the lift pump is working or sounds like it is. I did not brake the return line it was just attached to what the test port was attached to. Stock filter is just bypassed with a hose in place of the filter and housing. I was wondering if I Can drill and tap where the test port was and thread a nipple with adapter so I can install the new test port? If it is sealed wouldnt that fix the issue?
 

·
Premium Member
Joined
·
26,484 Posts
A leaking return line is not associated with a fuel supply P0087.
Sealing it won't take much effort, returning fuel is low pressure. Well, supply is low too. But return is even lower.

That's something different from the supply test port I thought you described, which is on a long stem sticking up between the Alt and the T-stats.

Sry, Don't have a solution to that break.
But I can talk P0087s all day. :howdy
 

·
Premium Member
Joined
·
9,089 Posts
https://lincolndieselspecialties.com/i-23848426-gm-oem-front-fuel-feed-return-pipe-2004-5-2010.html

I think that is what you want. No pictures they are, so I can’t be certain, still trying to find a picture somewhere. Give them a call, I know they would be more than willing to make sure you get the right part. You are correct, the feed/return from the factory filter location both go through the Schrader valve, as well as the passenger side return off of the injectors.

As for the code, your FPRV could be weak/popping. That would probably throw a code under heavy throttle conditions.


Sent from my iPhone using Tapatalk
 
1 - 7 of 7 Posts
Top