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Old 07-30-2010, 05:03 AM
Mark Rinker's Avatar
Mark Rinker Mark Rinker is offline
Join Date: Jun 2003
Posts: 5,813

Thanks for the input, John. You have been a wealth of insite over the last year and 50K miles since this problem began. I wish you had the opportunity to ride along and see the circumstances under which the code is set.

It appears to me from the handful of recent reported cases (of P0087 codes) that each scenario is a bit different, which would lend itself to a combination of multiple factors - i.e. tired injectors, erratic FPR, weak FRPR, collapsing fuel lines, etc.

I know of one commercial hauler that fixed the issue with fuel line replacement. Recently another person here on TDP reported that an FPR replacement did the trick for him.

At this time, I have moved the FRPR down the list of likely culprits, because my codes can be set at 16K# rail pressure, or 22K# rail pressure. My IP and rail can also hold 23K# rail pressure for minutes at a time while climbing an 7% grade, in third gear at 45mph, 3000rpm without setting the code. Upshift to 5th and let RPMs drop and 'Engine Load' hit 100% - and 'bing' you have a P0087. Which gear and throttle setting requires more fuel flow?

Its not as simple as it may appear, or we'd all have solved it in the same manner, with the same part. Or, lift pumps would come from the factory on every new GM Duramax truck.


Originally Posted by Kennedy View Post
Insufficient supply is cured by adding a lift pump setup which ALL Duramax engines should have. We are right back to verifying the condition of the fuel supply system and also augmenting it with a little push from behind.
...are you confident enough that adding a lift pump would have cured all the p0087 code problems mentioned above, i.e. overcoming fuel line restriction, FPR problems, weak/worn injectors, etc? If so - are you willing to sell your lift pump on those terms, refunding and restocking if the lift pump doesn't solve a customer's particular problem?

Question #1: Why did the truck function properly for the first 100K miles, in stock form, before starting to exhibit the p0087 code problems? i.e. what changed?

A: Wear and tear. Probably injectors, plus FPR, possibly fuel lines

Question #2 How many times can you reach up and reset the code, while driving in hot weather, in the mountains, with a loaded trailer, for the cost of a new set of injectors?

A: Many, many times in my case.

I'll tell you what you could sell alot of - that would be an ECM reflash to widen the tolerance for fuel pressure variances, or set the code without the limp. Remember - nobody reports a driveability problem, other than the one created by the limp mode!!!

2011 Chevrolet Tahoe 5.3L daily driver
  • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
  • Total GM diesel miles to date : ~950K

Last edited by Mark Rinker; 07-30-2010 at 05:35 AM.
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