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Old 01-25-2013, 04:40 PM   #1 (permalink)
sixto
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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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Old 01-25-2013, 04:50 PM   #2 (permalink)
crankme69
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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
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1995 1500 Silverado 6.5TD 2WD Ext Cab 230K, FSD cooler bumper mount, Buddy 3 pos chip, DE 4" exhaust, K47 with F intake

1995 Tahoe 6.5TD 202K Buddy chipped cat & muff delete

1994 1500 Silverado 6.5TD 2WD RCLB 165K Buddy chip EGR disabled else bone stock work in progress...

1996 TDI Passat 190K 49mpg avg

2005 FLHTC 107 Twin Cam Fueling 574 cams, 10.1 CR, Mik 45, DTT map, 3.37 final, E1 clutch & VPC with SE 6 sp, SnS roller rockers Bub 7 2 into 1 exhaust, 120Tq & 120Hp

1995 FXD 80 EVO V Thunder 2015 cam, Mikuni 42, SE slip ons, 80Tq & 70Hp
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Old 01-25-2013, 05:45 PM   #3 (permalink)
Jake
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X2 on that. Perfectly normal. I miss it when it DOESN'T happen....

Jake
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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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Old 01-25-2013, 10:38 PM   #4 (permalink)
r85sub
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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.
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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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Old 01-25-2013, 10:50 PM   #5 (permalink)
crankme69
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Are we sure, really! Are you asking both of us lol?

I needed a good laugh tonight thanks
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1995 1500 Silverado 6.5TD 2WD Ext Cab 230K, FSD cooler bumper mount, Buddy 3 pos chip, DE 4" exhaust, K47 with F intake

1995 Tahoe 6.5TD 202K Buddy chipped cat & muff delete

1994 1500 Silverado 6.5TD 2WD RCLB 165K Buddy chip EGR disabled else bone stock work in progress...

1996 TDI Passat 190K 49mpg avg

2005 FLHTC 107 Twin Cam Fueling 574 cams, 10.1 CR, Mik 45, DTT map, 3.37 final, E1 clutch & VPC with SE 6 sp, SnS roller rockers Bub 7 2 into 1 exhaust, 120Tq & 120Hp

1995 FXD 80 EVO V Thunder 2015 cam, Mikuni 42, SE slip ons, 80Tq & 70Hp
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Old 01-25-2013, 11:01 PM   #6 (permalink)
r85sub
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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.
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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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Old 01-25-2013, 11:50 PM   #7 (permalink)
r85sub
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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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Old 01-26-2013, 12:19 AM   #8 (permalink)
THEFERMANATOR
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Quote:
Originally Posted by r85sub View Post
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?
The fuel pump side of your OPS has burned out is all. Not a big deal on an OBDII since the ECM will still run the lift pump as normal.
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Old 01-26-2013, 12:42 AM   #9 (permalink)
r85sub
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Sweet. Thanks for clearing it up. I will get one on Monday.
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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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Old 01-26-2013, 07:42 AM   #10 (permalink)
crankme69
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Ok that sounds more like it.

But why are ya gonna replace it...what are you gonna gain?
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1995 1500 Silverado 6.5TD 2WD Ext Cab 230K, FSD cooler bumper mount, Buddy 3 pos chip, DE 4" exhaust, K47 with F intake

1995 Tahoe 6.5TD 202K Buddy chipped cat & muff delete

1994 1500 Silverado 6.5TD 2WD RCLB 165K Buddy chip EGR disabled else bone stock work in progress...

1996 TDI Passat 190K 49mpg avg

2005 FLHTC 107 Twin Cam Fueling 574 cams, 10.1 CR, Mik 45, DTT map, 3.37 final, E1 clutch & VPC with SE 6 sp, SnS roller rockers Bub 7 2 into 1 exhaust, 120Tq & 120Hp

1995 FXD 80 EVO V Thunder 2015 cam, Mikuni 42, SE slip ons, 80Tq & 70Hp
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