Those lines won't show much of a obstruction at idle or even at 3000 rpm's in the shop. It's more of a load thing (trailer, hill, WOT, PULL BABY PULL!)
GMC World Class Technician
Those lines won't show much of a obstruction at idle or even at 3000 rpm's in the shop. It's more of a load thing (trailer, hill, WOT, PULL BABY PULL!)
1998 Chevy k-2500 454 147,000 miles and climbing!
1993 Pontiac G/A Big Block 3.3 Liter 140,000 miles and still going too!
Enthusiast
Hmmm...duely noted.
I would sure like to get a fresh set of eight sprays, if possible, since the return rates indicate that as necessary, but...
The truck will certainly be up on the hoist looking into the other possiblity.
Thanks for taking the time to post. Possibly its the combination of the two.
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
Enthusiast
I also inspected the supply line with the truck on a hoist, it appears fine (no obvious damage or kinks) but may replace entire supply line anyway, to rule out the possibility of an intermittent collapse... which would be nearly impossible to see unless you are under the truck when the high fuel request was happening!!!Originally Posted by Duramaster
(BTW it doesn't take WOT to trigger my P0087. It does take a fair load (12K#), warm/hot engine temps, and a reasonable climb - one that would put the %LOAD at 95% or better on the OBDII data...)
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
Administrator
Have you given thought to a lift pump setup? Certainly not a complete solution, but could edge you across the threshold causing the fault. What's JK think about it?
Enthusiast
Had thought about that ... hadn't taken it any further. I still have a NIB Delco inline lift pump from the 6.5L days, would that provide enough flow?
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
Administrator
It should, at OEM to moderate fueling levels. It should work, at least, for test purposes. JK has the stuff, though (on my Christmas list). A test shouldn't be too difficult, and you wouldn't have to hard-wire or fail-safe it for the testing. If it doesn't help, you're only out some time and a little change for wiring and line coupling. If it does work, you're well ahead.
Enthusiast
The p0087s were all produced at stock fueling levels, and a 6.6L doesn't use much more fuel than a 6.5L, right - if your loaded mileage is the same?
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
Administrator
Technically, correct. However, not all the fuel pumped actually finds a cylinder. Both engines use the fuel for lubricant and coolant, and return a significant portion to the tank. I don't know which returns more. I don't know which carries more heat, but my truck, even in Winter, will show a hot running fuel temp of 140°+. I've never observed the fuel temp or return rates of a 6.5 system, so I can't compare. I don't know if it even matters, one way or another. I do know several folks who have installed, and are currently running, a 6.5 OEM pump, or similar aftermarket, successfully on LB7's.
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