Used 2017 3500 DRW - Chevy and GMC Duramax Diesel Forum
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post #1 of 12 (permalink) Old 08-30-2019, 03:36 PM Thread Starter
 
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Used 2017 3500 DRW

I'm buying my father in laws 2017 GMC 3500 DRW Denali. It has 180,000 on it. He drives a lot !! But he is the only one driving it so I know it hasn't been driven hard. He has had a couple of problems with the fuel system. I think fuel injectors or something like that. And it has a vibration under the dash or hood that make a buzzing sound at a certain rpms. Doesn't really bother me. I'm getting it for about half of what's its worth. Not complaining there. Just wondering if I should be worried about any other problems someone may have had with this particular truck ?
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post #2 of 12 (permalink) Old 08-30-2019, 10:48 PM
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Well that's depressing that he had issues with the injectors.. did he run any fuel additives?

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post #3 of 12 (permalink) Old 08-31-2019, 02:22 AM Thread Starter
 
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No additives.
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post #4 of 12 (permalink) Old 08-31-2019, 01:25 PM
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Bummer. Well, seeing how you are new on here (I'm assuming you are new with only 3 posts) Please familiarize yourself with the fuel pump issues common to the 2011+ models. They call it a CP4 pump which Ford and Dodge and GM have in their modern diesels. It's been a source of a lot of concern by many on here as it is an expensive repair if it ever goes out. Not as simple as simply replacing the fuel pump. It does other damage as well when it goes out. With your father not having run additives (extra lubricity is the key) and having already seen injector failure, I'd imagine it puts this truck at a high risk of fuel pump failure. From what I've read on here thus far, the rectification for this is to swap out the CP4 pump for the previous generation CP3 pump before the CP4 goes out, which will be much less expensive. So please read up on that.

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post #5 of 12 (permalink) Old 08-31-2019, 01:57 PM
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Quote:
Originally Posted by GoBlowSnow View Post
Bummer. Well, seeing how you are new on here (I'm assuming you are new with only 3 posts) Please familiarize yourself with the fuel pump issues common to the 2011+ models. They call it a CP4 pump which Ford and Dodge and GM have in their modern diesels. It's been a source of a lot of concern by many on here as it is an expensive repair if it ever goes out. Not as simple as simply replacing the fuel pump. It does other damage as well when it goes out. With your father not having run additives (extra lubricity is the key) and having already seen injector failure, I'd imagine it puts this truck at a high risk of fuel pump failure. From what I've read on here thus far, the rectification for this is to swap out the CP4 pump for the previous generation CP3 pump before the CP4 goes out, which will be much less expensive. So please read up on that.
GM stopped using the CP4 in 2016.
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post #6 of 12 (permalink) Old 08-31-2019, 02:35 PM
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Quote:
Originally Posted by GoBlowSnow View Post
Bummer. Well, seeing how you are new on here (I'm assuming you are new with only 3 posts) Please familiarize yourself with the fuel pump issues common to the 2011+ models. They call it a CP4 pump which Ford and Dodge and GM have in their modern diesels. It's been a source of a lot of concern by many on here as it is an expensive repair if it ever goes out. Not as simple as simply replacing the fuel pump. It does other damage as well when it goes out. With your father not having run additives (extra lubricity is the key) and having already seen injector failure, I'd imagine it puts this truck at a high risk of fuel pump failure. From what I've read on here thus far, the rectification for this is to swap out the CP4 pump for the previous generation CP3 pump before the CP4 goes out, which will be much less expensive. So please read up on that.
2017 L5P uses a Denso HP4 pump
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post #7 of 12 (permalink) Old 08-31-2019, 04:46 PM
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Injectors were an issue on the '17s and '18's. Saw a few who had 1 to 3 or so injectors replaced. Wasn't super common but enough to register. Really haven't seen that on the '19s.

2002 Chevy 2500HD Crew - Original owner - 410,000 miles so far. All stock with the exception of a lift pump.
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post #8 of 12 (permalink) Old 09-01-2019, 06:06 AM
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Quote:
Originally Posted by GoBlowSnow View Post
Bummer. Well, seeing how you are new on here (I'm assuming you are new with only 3 posts) Please familiarize yourself with the fuel pump issues common to the 2011+ models. They call it a CP4 pump which Ford and Dodge and GM have in their modern diesels. It's been a source of a lot of concern by many on here as it is an expensive repair if it ever goes out. Not as simple as simply replacing the fuel pump. It does other damage as well when it goes out. With your father not having run additives (extra lubricity is the key) and having already seen injector failure, I'd imagine it puts this truck at a high risk of fuel pump failure. From what I've read on here thus far, the rectification for this is to swap out the CP4 pump for the previous generation CP3 pump before the CP4 goes out, which will be much less expensive. So please read up on that.
This is what's wrong with this forum, morons like this that want to give advice to people but have absolutely no idea what the hell they are talking about.
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2018 GMC 2500 CCSB - Denali - White - L5p
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post #9 of 12 (permalink) Old 09-01-2019, 06:07 AM
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HAHAHAHA he said " PLEASE READ UP ON THAT". LMAO

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post #10 of 12 (permalink) Old 09-01-2019, 07:40 AM
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Originally Posted by rboyd5589 View Post
This is what's wrong with this forum, morons like this that want to give advice to people but have absolutely no idea what the hell they are talking about.
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Originally Posted by CDmax16 View Post
GM stopped using the CP4 in 2016.
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Originally Posted by Justin Evers View Post
2017 L5P uses a Denso HP4 pump
Yeah, and then two people came along and got us back on track...guess it's not so bad after all, huh?

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