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01-25-2013, 04:40 PM
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#1 (permalink) |
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Diesel Technician
Join Date: May 2007
Location: SF Bay Area
Posts: 213
iTrader Score: 0 reviews
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fuel pump run-on?
I noticed that the electric fuel pump continues ticking for about 5 seconds after shutting off the engine. Is this normal?
Sixto '97 C2500 'burb 179K miles |
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01-25-2013, 04:50 PM
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#2 (permalink) |
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Diesel Master
Join Date: Oct 2009
Posts: 1,640
iTrader Score: 0 reviews
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Yup normal it will run until the oil pressure drops off. You will notice it more when it's cold out & the oil is more viscous takes longer for the pressure to register zero
__________________
1995 1500 Silverado 6.5L 2WD Ext Cab 230K, FSD cooler bumper mount, Buddy 3 pos chip, DE 4" exhaust, K47 with F intake 1995 Tahoe Buddy chipped cat & muff delete 202K 1996 TDI Passat 180K 49mpg avg 2005 bagger 107", Fueling 574 cams, 10.1 CR, Mik 45 carb, SE timing map, 3.37 final, Energy1 clutch & VPC plate with SE 6 sp, SnS roller rockers Bub 7 2 into 1 exhaust, 124 Tq & 120Hp 1995 FXD Superglide, Mikuni 42 carb, SE slip ons, V Thunder 2015 cam 80 Tq & 70 Hp
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01-25-2013, 05:45 PM
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#3 (permalink) |
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Diesel Master
Join Date: Oct 2003
Location: Hayes, VA
Posts: 1,454
iTrader Score: 0 reviews
Old School Oil Burners (Old SOBs) Member |
X2 on that. Perfectly normal. I miss it when it DOESN'T happen....
Jake
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Jake Brodersen 96 K2500 Suburban Peninsular Diesel 6.5TD 3.73 gears, Heath Remote PMD, Heath Heavy Duty Lift Pump, Banks 3" downpipe, BD 4" exhaust, JK headlight booster kit, Heath HP4 PCM, manual glow plug switch, vacuum pump eliminated Gauges: fuel pressure, manifold pressure, and EGT in a 3 gauge pod, plus engine oil and trans. oil temp on top of the dash. Bilstein shocks and Hotchkis sway bars on the greasy side. High idle mod too. Grover 1510 (Firetruck) air horn. Four wheel disc brakes. 2012 Acura TL V-6 (280hp) 2006 Harley Springer Softail FXSTSI (already modded and putting out more power)  2002 Chevy S-10, step side, regular cab, 2.2 litre w/5 speed 1992 Chevy S-10, extended cab, 2.8 V-6 w/5 speed |
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01-25-2013, 10:38 PM
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#4 (permalink) |
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Diesel Specialist
Join Date: Jul 2005
Location: Carmichael, CA
Posts: 619
iTrader Score: 0 reviews
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Are you sure? On a 97? Mine has never on my 99, but is 97 the year that they are controlled by a relay, and not run through the oil pressure switch. Mine comes on when the key is on and glow plugs warming up. And as soon as I turn off my truck, it stops. I had a bad relay once and intermittently it would stay running after the key was off. Long story, but it was a new relay from Napa.
__________________
 1999 GMC K2500 Crew Cab 6.5L,"F" engine code,4L80E trans.,4.10 gears,K&N, 3" downpipe, 4" exhaust, 2.25" mandrel crossover pipe.VDO boost,pyro,trans. temp gauges.Kennedy boost contol.Remote mount PMD.Heath GLE reflash,HDP Balance Flow.Heath HO injectors,Custom intercooler.Bulletproof bedliner.Leer shell.43 gal. TransferFlow tank/toolbox combo.-ATA hanging intercooler club #8 -1999 25 foot Wildwood toyhauler-9000lbs. with toys in it. -2004 Honda Rubicon(Wife's Quad) -2000 Honda Foreman, Detroit Gearless locker.Hi-Lifter lift kit.26" Gators.Snorkel to 48".Aluminum skid plates.Hi-Lifter front and rear disc brakes. -1988 Suzuki LT230(daughter's quad) -2001 Kasea Skyhawk 50(son's quad) -70cc big bore kit, Trinity exhaust, 20mm carb.,Uni filter, lightened clutch, douglas wheels, RAZR tires. |
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01-25-2013, 10:50 PM
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#5 (permalink) |
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Diesel Master
Join Date: Oct 2009
Posts: 1,640
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Are we sure, really! Are you asking both of us lol?
I needed a good laugh tonight thanks
__________________
1995 1500 Silverado 6.5L 2WD Ext Cab 230K, FSD cooler bumper mount, Buddy 3 pos chip, DE 4" exhaust, K47 with F intake 1995 Tahoe Buddy chipped cat & muff delete 202K 1996 TDI Passat 180K 49mpg avg 2005 bagger 107", Fueling 574 cams, 10.1 CR, Mik 45 carb, SE timing map, 3.37 final, Energy1 clutch & VPC plate with SE 6 sp, SnS roller rockers Bub 7 2 into 1 exhaust, 124 Tq & 120Hp 1995 FXD Superglide, Mikuni 42 carb, SE slip ons, V Thunder 2015 cam 80 Tq & 70 Hp
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01-25-2013, 11:01 PM
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#6 (permalink) |
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Diesel Specialist
Join Date: Jul 2005
Location: Carmichael, CA
Posts: 619
iTrader Score: 0 reviews
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99 must be different. I have owned my truck for 8 years and the fuel pump has never continued to run when the truck was turned off(except with the bad relay). Runs when the key is on, but when the key is turned off so is the power to it.
__________________
1999 GMC K2500 Crew Cab 6.5L,"F" engine code,4L80E trans.,4.10 gears,K&N, 3" downpipe, 4" exhaust, 2.25" mandrel crossover pipe.VDO boost,pyro,trans. temp gauges.Kennedy boost contol.Remote mount PMD.Heath GLE reflash,HDP Balance Flow.Heath HO injectors,Custom intercooler.Bulletproof bedliner.Leer shell.43 gal. TransferFlow tank/toolbox combo.-ATA hanging intercooler club #8 -1999 25 foot Wildwood toyhauler-9000lbs. with toys in it. -2004 Honda Rubicon(Wife's Quad) -2000 Honda Foreman, Detroit Gearless locker.Hi-Lifter lift kit.26" Gators.Snorkel to 48".Aluminum skid plates.Hi-Lifter front and rear disc brakes. -1988 Suzuki LT230(daughter's quad) -2001 Kasea Skyhawk 50(son's quad) -70cc big bore kit, Trinity exhaust, 20mm carb.,Uni filter, lightened clutch, douglas wheels, RAZR tires. |
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01-25-2013, 11:50 PM
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#7 (permalink) |
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Diesel Specialist
Join Date: Jul 2005
Location: Carmichael, CA
Posts: 619
iTrader Score: 0 reviews
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So you got me thinking. So I went out to check my truck. KOEO, lift pump runs while wait to start light is on. KOER lift pump running, pull the fuel pump relay and lift pump quits, plug in relay with engine still running, lift pump runs. So that leads me to believe the newer trucks(at least 1999) do not use the OPS, except to signal relay that there is oil pressure. If it ran through the switch it would have continued to run with the relay taken out. And if it so happened I had a bad oil pressure switch and didn't know it, I should have lift pump for the KOEO prime, but quit once started. Correct?
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1999 GMC K2500 Crew Cab 6.5L,"F" engine code,4L80E trans.,4.10 gears,K&N, 3" downpipe, 4" exhaust, 2.25" mandrel crossover pipe.VDO boost,pyro,trans. temp gauges.Kennedy boost contol.Remote mount PMD.Heath GLE reflash,HDP Balance Flow.Heath HO injectors,Custom intercooler.Bulletproof bedliner.Leer shell.43 gal. TransferFlow tank/toolbox combo.-ATA hanging intercooler club #8 -1999 25 foot Wildwood toyhauler-9000lbs. with toys in it. -2004 Honda Rubicon(Wife's Quad) -2000 Honda Foreman, Detroit Gearless locker.Hi-Lifter lift kit.26" Gators.Snorkel to 48".Aluminum skid plates.Hi-Lifter front and rear disc brakes. -1988 Suzuki LT230(daughter's quad) -2001 Kasea Skyhawk 50(son's quad) -70cc big bore kit, Trinity exhaust, 20mm carb.,Uni filter, lightened clutch, douglas wheels, RAZR tires. |
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01-26-2013, 12:19 AM
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#8 (permalink) | |
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Diesel Master
Join Date: Aug 2005
Posts: 4,671
iTrader Score: 0 reviews
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Quote:
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01-26-2013, 12:42 AM
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#9 (permalink) |
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Diesel Specialist
Join Date: Jul 2005
Location: Carmichael, CA
Posts: 619
iTrader Score: 0 reviews
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Sweet. Thanks for clearing it up. I will get one on Monday.
__________________
1999 GMC K2500 Crew Cab 6.5L,"F" engine code,4L80E trans.,4.10 gears,K&N, 3" downpipe, 4" exhaust, 2.25" mandrel crossover pipe.VDO boost,pyro,trans. temp gauges.Kennedy boost contol.Remote mount PMD.Heath GLE reflash,HDP Balance Flow.Heath HO injectors,Custom intercooler.Bulletproof bedliner.Leer shell.43 gal. TransferFlow tank/toolbox combo.-ATA hanging intercooler club #8 -1999 25 foot Wildwood toyhauler-9000lbs. with toys in it. -2004 Honda Rubicon(Wife's Quad) -2000 Honda Foreman, Detroit Gearless locker.Hi-Lifter lift kit.26" Gators.Snorkel to 48".Aluminum skid plates.Hi-Lifter front and rear disc brakes. -1988 Suzuki LT230(daughter's quad) -2001 Kasea Skyhawk 50(son's quad) -70cc big bore kit, Trinity exhaust, 20mm carb.,Uni filter, lightened clutch, douglas wheels, RAZR tires. |
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01-26-2013, 07:42 AM
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#10 (permalink) |
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Diesel Master
Join Date: Oct 2009
Posts: 1,640
iTrader Score: 0 reviews
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Ok that sounds more like it.
But why are ya gonna replace it...what are you gonna gain?
__________________
1995 1500 Silverado 6.5L 2WD Ext Cab 230K, FSD cooler bumper mount, Buddy 3 pos chip, DE 4" exhaust, K47 with F intake 1995 Tahoe Buddy chipped cat & muff delete 202K 1996 TDI Passat 180K 49mpg avg 2005 bagger 107", Fueling 574 cams, 10.1 CR, Mik 45 carb, SE timing map, 3.37 final, Energy1 clutch & VPC plate with SE 6 sp, SnS roller rockers Bub 7 2 into 1 exhaust, 124 Tq & 120Hp 1995 FXD Superglide, Mikuni 42 carb, SE slip ons, V Thunder 2015 cam 80 Tq & 70 Hp
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