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post #1 of 18 (permalink) Old 11-09-2019, 03:37 PM Thread Starter
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2007 Redline HPFP clicking confirmation

I finally picked up my 2007 Redline a few weeks ago after a lot of challenges (long story). The car runs great.

However, there is a clicking or ticking sound coming from the engine. After researching I think (hope) it's the high pressure fuel pump. Can you take a look/listen to the attached and confirm that is what it is?

https://drive.google.com/file/d/184j...ew?usp=sharing
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post #2 of 18 (permalink) Old 11-09-2019, 04:58 PM
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Yup. HPFP - no concern

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post #3 of 18 (permalink) Old 11-09-2019, 11:47 PM Thread Starter
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Thanks!
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post #4 of 18 (permalink) Old 11-09-2019, 11:48 PM Thread Starter
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Thanks! I appreciate the reply
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post #5 of 18 (permalink) Old 11-12-2019, 01:04 PM
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Yup. HPFP - no concern
TomatoSoup..

Question for you....I just had my HPFP replaced, and was wondering if the leaking fuel into the oil issue is one the shows up only when the ticking gets weird/inconsistent, for can it also happen when the HPFP is otherqise working fine?
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post #6 of 18 (permalink) Old 11-12-2019, 03:01 PM
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TomatoSoup..

Question for you....I just had my HPFP replaced, and was wondering if the leaking fuel into the oil issue is one the shows up only when the ticking gets weird/inconsistent, for can it also happen when the HPFP is otherqise working fine?
I would guess it can happen in either case, but I have not had to replace mine, so cannot really comment. It would be better to get the opinions of folks who've had the issue... like @The_Ghost

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post #7 of 18 (permalink) Old 11-12-2019, 03:03 PM
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TomatoSoup..

Question for you....I just had my HPFP replaced, and was wondering if the leaking fuel into the oil issue is one the shows up only when the ticking gets weird/inconsistent, for can it also happen when the HPFP is otherqise working fine?
I would guess it can happen in either case, but I have not had to replace mine, so cannot really comment. It would be better to get the opinions of folks who've had the issue... like @The_Ghost

Owner of "Campbelle", a Brazen 2008 GXP ... with mods piling up...
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post #8 of 18 (permalink) Old 11-13-2019, 11:29 AM
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HPFP failure is not uncommon. I have only read of a couple of cases of the HPFP continuing to function while leaking fuel into the oil.
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post #9 of 18 (permalink) Old 11-13-2019, 09:53 PM
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I can vouch....mine failed and continued to run. You "should" get a p2178 "too rich at idle" if this is happening. You may also get backfiring if you leave it in gear during coast-down.
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post #10 of 18 (permalink) Old 11-14-2019, 12:49 PM
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Garage
FYI re the original question, the factory later (2009?) fitted a cover to the HPFP that reduced the sound. No idea if that is still available from GM but you could probably find one from a wrecked car.

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post #11 of 18 (permalink) Old 11-14-2019, 01:18 PM
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I can vouch....mine failed and continued to run. You "should" get a p2178 "too rich at idle" if this is happening. You may also get backfiring if you leave it in gear during coast-down.
I never got a check engine light at all, but I was getting fuel in my oil so I did change it. I also never got backfiring....
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post #12 of 18 (permalink) Old 11-14-2019, 01:19 PM
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I can vouch....mine failed and continued to run. You "should" get a p2178 "too rich at idle" if this is happening. You may also get backfiring if you leave it in gear during coast-down.
Do you know what I should look for on the old HPFP to tell if it was in fact leaking fuel into my oil?
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post #13 of 18 (permalink) Old 11-14-2019, 10:45 PM
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Do you know what I should look for on the old HPFP to tell if it was in fact leaking fuel into my oil?
Nope...it's a sealed unit, so I would assume that the bladder goes bad. If you left it go long enough, you would get the p2178. My issue is that all oil I've ever smelled has a hint of gasoline to it. And mine had that hint. It wasn't till I heard it backfire one day, and then the next day the CEL was set with the code, that I was certain I had the issue.
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post #14 of 18 (permalink) Old 11-15-2019, 01:04 PM
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Nope...it's a sealed unit, so I would assume that the bladder goes bad. If you left it go long enough, you would get the p2178. My issue is that all oil I've ever smelled has a hint of gasoline to it. And mine had that hint. It wasn't till I heard it backfire one day, and then the next day the CEL was set with the code, that I was certain I had the issue.
Where is the bladder located? Also, if I changed the HPFP and the gasket did I fix the bladder as well?

Sorry to ask seemingly stupid questions, but I'm trying to make sure I actually fixed a problem and everything I read about said that the amount of gas I was getting in my oil had to be the HPFP, and the only way to fix the HPFP leaking gas into the oil was to change it out with the gasket....
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post #15 of 18 (permalink) Old 11-15-2019, 01:11 PM
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As Ghost said - it's a sealed unit (the bladder would be inside) - although I'm not sure if there *is* a bladder. I just thought it was a piston/cylinder.


I also found this teardown video (not our HPFP, but probably similar)...


Owner of "Campbelle", a Brazen 2008 GXP ... with mods piling up...

Last edited by TomatoSoup; 11-15-2019 at 01:18 PM.
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