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09-02-2019, 04:43 PM
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#1
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Name: PPUMPFUMMINS
Title: Diesel Enthusiast
Status: Not Here
Join Date: Apr 2017
Location: Pennsylvania
Member`s Gallery
Posts: 128
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Rpm too high
So got my fummins all done, has a p24v, 13mm pump, built by scheid. I noticed idle was high on first start, but decided to drive it a few times, before adjusting it. Tried to adjust it today, and now won’t start without the throttle, and lowest I can get rpms without engine stalling is like 1000 rpms. Has .093 lines, 6x15 injectors, fass 240. Has scheid regulated return. Fuel pressure at 65 psi. Any help would be appreciated. Pump has maybe 50 miles on it since it was built.
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09-02-2019, 05:22 PM
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#2
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,396
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Back off the gov springs 2 clicks.
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09-02-2019, 05:41 PM
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#3
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Name: PPUMPFUMMINS
Title: Diesel Enthusiast
Status: Not Here
Join Date: Apr 2017
Location: Pennsylvania
Member`s Gallery
Posts: 128
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Ok I’ll give that a try
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09-02-2019, 09:40 PM
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#4
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Name: RonA
Title: Too Much Time
Status: Not Here
Join Date: Feb 2008
Location: Liberal ground zero.
Member`s Gallery
Posts: 11,053
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I had three 13 mm pumps, all were like that. If I set the idle down where it should be, it would start bucking in gear(automatic) at idle. I'd loosen the springs as much as I could but it always seemed to need 1 or 2 more clicks but they were as loose as they could go. Ran out of fuel before 3000 rpm as well with the springs backed off. Always wondered if there was a way to fix the problem.
__________________
55 years of work and all I got was a T-shirt.
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09-02-2019, 10:20 PM
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#5
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Name: Downtownbrown
Title: Diesel Enthusiast
Status: Not Here
Join Date: Sep 2017
Location: North texas
Member`s Gallery
Posts: 157
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Quote:
Originally Posted by RonA
I had three 13 mm pumps, all were like that. If I set the idle down where it should be, it would start bucking in gear(automatic) at idle. I'd loosen the springs as much as I could but it always seemed to need 1 or 2 more clicks but they were as loose as they could go. Ran out of fuel before 3000 rpm as well with the springs backed off. Always wondered if there was a way to fix the problem.
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About to send a pump to seth for this exact problem, could be the springs themselves, ive fixed a ton of peoples gov spring idle issues but this one in particular i havent been able to. Too loose =good idle but no top end, one click tighter =1000rpm idle and good power
Sent from my iPhone using Tapatalk
__________________
Austin-
1994 rclb dodge 2500 5spd
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05-15-2022, 07:57 AM
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#6
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Name: Carbur8tr
Title: Green Behind the Ears
Status: Not Here
Join Date: Jul 2013
Member`s Gallery
Posts: 72
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Quote:
Originally Posted by Downtownbrown
About to send a pump to seth for this exact problem, could be the springs themselves, ive fixed a ton of peoples gov spring idle issues but this one in particular i havent been able to. Too loose =good idle but no top end, one click tighter =1000rpm idle and good power
Sent from my iPhone using Tapatalk
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Old thread, but any luck in finding a cure?
Sent from my iPhone using Tapatalk
__________________
01, 110lb springs, studs, Gen 1 Airdog,60/68/14 non-gated, BD intercooler,DFI 7x.009, HO*VP, Carli 3' coils and control arms, DT ProFab trac bar, Red Head Steering gear, steering stabilizer, maxx links,*08.5 steering upgrade
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05-15-2022, 09:44 AM
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#7
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,396
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It's all in the gov springs used, I switched to using Haisley 5k's way back, and my 13mm cranks with a bump of the key, and has a strong and low idle.
I'm sure after all this time there are other good spring sets out there, but used to be for 5k's, the Haisleys were the best all around.
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05-15-2022, 11:56 AM
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#8
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Name: 95cummins5.9
Title: Old man ***** gossiper
Status:
Here
Join Date: Jun 2012
Location: U.S.A
Member`s Gallery
Posts: 4,715
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Sometimes giving the smoke screw a turn will cure this on a 12mm pump after Gov springs install too.
__________________
Quote:
Originally Posted by jfaulkner
puzzy, tune it.
I don't own anything stock, from engines to boobies I've modded them all. Life is too short to live with mediocre chit.
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