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00:37:32 - 05/02/2024
Dakota Performance
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Do it Right
Dakota Enthusiast
 
11/09/2002
08:43:48
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 Subject: fuel pump question!
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Message:
Hi Everyone.I have a 2001 QC 5.9 L ,I use for work. I tow a 6' x 10' enclosed trailor,with 53,000 miles on truck ,45,000 miles on trailor. My oil pressure is low at idle but high at cruising 55-60 mph. Lately, My dak has been hard to start. 3 tries , then starts .My Question is , Does the PCM read oil pressure at start up And controlls fuel pump operation at start up.I have tested fuel pressure 51 psi key on engine off ,fuel pump on for 3sec then off by its self! leak down to 0 PSI - 30 seconds .key off ,key on 0 pressure ,no pump! I Am going to replace timing chain soon becuse of milage / towing . Should I replace oil pump at same time ? sorry for the long post. Thanks Larry
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Fubar512
GenIII
11/09/2002
19:25:42
|  RE: fuel pump question!
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Message:
Larry, I've encountered that prob on a few Daks and Durangos with either 5.2's or 5.9's, and found that the oil pickup screen was just about plugged solid with sludge, in every case!
Some Dak owners on this site have reported that changing over to a pure syntheitic oil will eventually break down the sludge build-up after a few oil changes.
That being said, I've been running synthetic oils in all my vehicles since the mid-80's, and I swear by them.
Confucious say: Any man can pee on wall. Be a true hero and crap on ceiling! I've tried being a hero once too often...
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Do it Right
Dakota Enthusiast
11/10/2002
06:30:39
|  RE: fuel pump question!
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Message:
Fubar512,thanks for the reply.I have switch to aimsoil afew months back , on second oil change.Iuse my truck for work , 150 miles + a day .I ordered mellion (spelling) oil pump on friday with new pickup .While i have her down ill take care of it too.In your mods you have done the KRC timing trick ,was this agood mod for you ? also the transco kit.I am up for trans service soon . Thanks Larry
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Fubar512
GenIII
11/11/2002
03:42:06
| RE: fuel pump question!
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Message:
The KRC timing mod gave me a bit more low end torque, and was well worth, IMHO. Just be sure to drop down to a 180 degree thermostat, and install a set of Autolite 3923 plugs, to keep you from pinging.
The Transgo kit was also a worthwhile investment, as it made the shifts crisper, reduced slippage, etc.
Confucious say: Any man can pee on wall. Be a true hero and crap on ceiling! I've tried being a hero once too often...
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CW
GenIII
11/11/2002
17:09:54
|  RE: fuel pump question!
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Message:
If the fuel pump leaks down it will cause hard start pronlems because it takes time to bring the fuel pressure up. You need the fuel pressure regulator/filter on the top of the fuel pump.
4.7 HO, CW style
2001 4.7 5sp 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" Z-tube, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams, Robert shaw 180 therm, HO intake manifold.
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Do it Right
Dakota Enthusiast
11/12/2002
05:31:47
| RE: fuel pump question!
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Message:
Thanks CW,Is the regulator separate,or a one piece unit ? fuelpump/reg/filter ,price? After I change my timing chain ,I will go back to the fuel pump if the starting problem continues. Thanks Larry
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CW
GenIII
11/12/2002
08:57:52
| RE: fuel pump question!
IP: Logged
Message:
It is a separate unit from the fuel pump modual. Here is a pic. regulator/filter
4.7 HO, CW style
2001 4.7 5sp 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" Z-tube, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams, Robert shaw 180 therm, HO intake manifold.
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Do it Right
Dakota Enthusiast
11/14/2002
04:46:34
| RE: fuel pump question!
IP: Logged
Message:
Thanks CW, I will call around to get a price on regulator/filter.Larry
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Fubar512
GenIII
11/16/2002
14:15:06
| RE: fuel pump question!
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Message:
CW, Do It Right, I need to wipe my glasses before I read a post!
The aforementioned oil pump/screen prob was on trucks belonging to people who complained of an issue regarding "oil pressure being low or almost non-existant at idle."
I checked the oil pressure on these vehicles with a mechanical guage, to verify that their dash mounted electric guages were accurate, and saw that they did have unreasonably low oil pressure.
Further investigation revealed that they weren't big on routine maintenance, and as a result, said engines were packed with sludge.
Confucious say: Any man can pee on wall. Be a true hero and crap on ceiling! I've tried being a hero once too often...
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doit Right
Dakota Enthusiast
11/18/2002
20:53:27
| RE: fuel pump question!
IP: Logged
Message:
Fubar512 My maintiance Schedule ,oil 3,000 +/- 200 to 300 .My tranny, first oil change at 18,000 W /filter ,second @ 34,000 oil And filter.Next at 54,000 . Oilchange on rear Rear end Every 18,000 ,Moog Balljoints @ 24,000 ,Alignments 3. With trailor attached, It costs plenty to maintain ! Alot moore to replace!!! I have a Real Guage !(Mac tool) I will test the oil pressure let you know .
Larry
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