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09-11-2013, 06:05 PM
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#1
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Name: Kronic_187
Title: Mekanical injection junky
Status: Not Here
Join Date: Sep 2009
Location: British Columbia, Canada
Member`s Gallery
Posts: 1,343
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Losing prime over night... Injector issue?
First and foremost my fuel system is entirely not stock.
I have a drawstraw, 1/2 feed lines and 3/8 return... Fuel lab brushless pump and two fleetgaurd filter heads with an FS1212 and a FF5320, p-pump is dual fed.. And pressure is set with a by-pass fuel regulator. System holds a steady 40 pounds...
After truck has sat for longer then an hour its a bish to start and seems to run on 5 cylinders for awhile till it catchs prime and runs good till it sits again. No loss of power or more smoke.. Nothing.
I just replaced all my feed fuel hose, no leaks, freah filters.
I recently had a set of 5x.014 sac nozzles put on a set of bodies i had in the shop by a local injection business....
Is there anyway this could be an injector or delivery valve issue? Maybe sumthing in the pump letting it leak by?
There are no visible fuel leaks, everything is dry...
Starting to gt pissed off...
Might pull these injectors and stuff my stockers back in later just to make sure....
Any ideas?
__________________
96:CCLB/4x4:NV5600/3250DD, 178/208, 7mmDV's, 5x.016, 155*, 2095, 4GSK, H11, 61.5/68/.9-88/96/1.32, Hammy VS/Manton PR, Dual 3.5" Pusher, 1/2"Feed-3/8Return,6" longarm, Junkyard Freespin Kit
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09-12-2013, 01:08 AM
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#2
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Name: Cummin_getit
Title: .
Status: Not Here
Join Date: May 2012
Location: Texas
Member`s Gallery
Posts: 12
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If you don't have any excessive smoke at initial start up I doubt a nozzle is leaking by into a cylinder. Sounds to me like a check valve issue. Park on an incline with the tank being at the lowest elevation in the fuel system and see if it makes it worse. If it does you definitely have fuel bleeding back into the tank and I would try a new overflow valve. If it has a bad seat or spring it could cause fuel to bleed back into the tank and cause the symptoms you are describing.
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99 3500 p24v, 4k, light afc spring, 2095, ground Afc foot, 10 plate, 22*, 110# vs, o-ringed & ported head, arp studs, 150 hp sticks, 66/68/.76, pusher intake, s&b cai, 5" tbe, AD150, 1/2 fuel lines, bdp sump, isspro gauges, Goerend tdtc, Goerend hpvb, billet input, deep sump
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09-12-2013, 04:28 AM
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#3
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Name: darren820
Title: Rookie
Status: Not Here
Join Date: Aug 2012
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Posts: 13
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+2.....sounds like an ofv issue
__________________
1998 12v cummins. 63/68/.83, 5x.012, 191 DVs, 16deg timing, 0 plate ff. Built goerend trans/tc.
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09-12-2013, 10:25 AM
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#4
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Name: Kronic_187
Title: Mekanical injection junky
Status: Not Here
Join Date: Sep 2009
Location: British Columbia, Canada
Member`s Gallery
Posts: 1,343
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If you read what i posted.... I dont have an overflow valve...
Not stock, using a by-pass regulator
About A week ago this all started happening and my #3 dv holder was leaking fuel... I took it apart and cleaned everything and it has stopped leaking... Still loaing prime though, dunno whats goin on. Can the injector bodies wear to the point of allowing fuel out the return line back to the tank? Here for losing prime?
__________________
96:CCLB/4x4:NV5600/3250DD, 178/208, 7mmDV's, 5x.016, 155*, 2095, 4GSK, H11, 61.5/68/.9-88/96/1.32, Hammy VS/Manton PR, Dual 3.5" Pusher, 1/2"Feed-3/8Return,6" longarm, Junkyard Freespin Kit
Last edited by Kronic_187; 09-12-2013 at 10:28 AM.
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09-12-2013, 10:39 AM
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#5
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Name: NELSON359
Title: trying to keep up
Status: Not Here
Join Date: Apr 2012
Location: maryland
Member`s Gallery
Posts: 803
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could it be the rack cap vibrated lose?
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95 rclb 11.41 @120mph SOLD
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09-12-2013, 10:44 AM
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#6
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Name: murphy41
Title: Too Much Time
Status: Not Here
Join Date: Jan 2009
Location: Utah
Member`s Gallery
Posts: 1,624
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If the delivery valve holder O-ring was leaking, I'd suggest replace it. I cleaned one of mine that were leaking fuel, and it quit leaking fuel "physically". BUT it was still bleeding out prime. Went back to that exact same DV O-ring, replaced it, and the issue went away. I've had this EXACT same issue a few times, and each time resulted in a DV holder O-ring.
__________________
Brandon
1997 2WD
Engineered Diesel
Manning Motorsports
Outlaw Diesel Performance (Utah)
AT Performance Diesel
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09-12-2013, 10:46 AM
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#7
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Name: Kronic_187
Title: Mekanical injection junky
Status: Not Here
Join Date: Sep 2009
Location: British Columbia, Canada
Member`s Gallery
Posts: 1,343
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........ Ok sumthin to look into
__________________
96:CCLB/4x4:NV5600/3250DD, 178/208, 7mmDV's, 5x.016, 155*, 2095, 4GSK, H11, 61.5/68/.9-88/96/1.32, Hammy VS/Manton PR, Dual 3.5" Pusher, 1/2"Feed-3/8Return,6" longarm, Junkyard Freespin Kit
Last edited by Kronic_187; 09-12-2013 at 10:47 AM.
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09-12-2013, 10:50 AM
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#8
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Name: murphy41
Title: Too Much Time
Status: Not Here
Join Date: Jan 2009
Location: Utah
Member`s Gallery
Posts: 1,624
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Only other time I've had the same type issue is when I had some copper return washers leaking on the injectors. But it'd struggle to start immediately after being shut off. Not after it sat for awhile.
__________________
Brandon
1997 2WD
Engineered Diesel
Manning Motorsports
Outlaw Diesel Performance (Utah)
AT Performance Diesel
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09-12-2013, 12:23 PM
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#9
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Name: fox
Title: Too Much Time
Status: Not Here
Join Date: Dec 2008
Location: central Illinois
Member`s Gallery
Posts: 908
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Check the fuel return line at the back of the head drivers side. My 95 did the same and fuel leak. It was letting air in which caused the loss of prime.
I simply slid the hose on it farther, and it stopped the issue.
This line is a welded line which cracked over time.
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1998 12 valve 4x4 2500 auto trans.
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09-13-2013, 01:16 AM
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#10
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Name: TxDiesel007
Title: Uncommon CR problemed
Status: Not Here
Join Date: Jul 2007
Location: South Texas
Member`s Gallery
Posts: 1,648
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overflow valve...
if that don't do it, the return line, if its the original will start to crack, replace the rubber section of it.. better yet, buy enough, eliminate that steel part, and run solid rubber lines to the tank..
worked great on my 12 valve.. and simpler to replace the hose in its entirety instead of fiddling with limited area with that steel hose
__________________
05 3500 auto 4x4
95 2500 5 spd 4x4
HUGE thanks to Dan and the boys at Valair Inc Clutch and Gomer at onesourcetruckaccessories!
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09-13-2013, 06:29 AM
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#11
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Name: Signal 73
Title: #2 is #1
Status: Not Here
Join Date: Jul 2006
Location: Connecticut
Member`s Gallery
Posts: 1,124
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Man some people reply without reading
__________________
96 2500 5sp CTD
04 Jetta TDI
51 M37/4BT/NV4500
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09-13-2013, 08:02 AM
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#12
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Name: moparmcg
Title: Diesel Enthusiast
Status: Not Here
Join Date: Apr 2010
Member`s Gallery
Posts: 180
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Quote:
Originally Posted by murphy41
If the delivery valve holder O-ring was leaking, I'd suggest replace it. I cleaned one of mine that were leaking fuel, and it quit leaking fuel "physically". BUT it was still bleeding out prime. Went back to that exact same DV O-ring, replaced it, and the issue went away. I've had this EXACT same issue a few times, and each time resulted in a DV holder O-ring.
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I've had this happen to me too with DV o ring being bad. This may sound dumb but check your fuel filter one i had starting issues with mine and someone told me to try a new filter and it solved the problem
__________________
Tow Rig 2012 CCSB 4x4 stock
Pulling truck 95 RCLB 4x4-The Dirty GIrl
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09-13-2013, 01:08 PM
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#13
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Name: Kronic_187
Title: Mekanical injection junky
Status: Not Here
Join Date: Sep 2009
Location: British Columbia, Canada
Member`s Gallery
Posts: 1,343
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You guys really need to read what i posted originally or go back to cumminsforum.....
This is pathetic
MY FUEL SYSTEM IS NOT STOCK
IM NOT USING AN OVERFLOW VALVE
I MADE MY OWN FUEL LINES BOTH FEED AND RETURN AND JUST REPLACED ALL THE FEED LINE AS WELL AS CHANGED MY FILTERS
wow.....
Leaking return o-rings show fuel... Everything is dry
Either my aeromotive by-pass regulator has manages to wash-out sumhow and not holding pressure anymore... Somehow letting air replace the fuel in the lines from the tank baxk to the injection pump leading me to think maybe its an injector body or dv issue in the pump itself... Cuz air is going along way up if thats the case
__________________
96:CCLB/4x4:NV5600/3250DD, 178/208, 7mmDV's, 5x.016, 155*, 2095, 4GSK, H11, 61.5/68/.9-88/96/1.32, Hammy VS/Manton PR, Dual 3.5" Pusher, 1/2"Feed-3/8Return,6" longarm, Junkyard Freespin Kit
Last edited by Kronic_187; 09-13-2013 at 01:11 PM.
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09-14-2013, 08:44 AM
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#14
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Name: inline
Title: Professional lurker
Status: Not Here
Join Date: Apr 2011
Location: Rhode Island
Member`s Gallery
Posts: 808
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The regulator or an injector pop pressure issue. check exhaust manifold for a cold/dead cylinder on start up.
__________________
2006 GMC VAN 6.6 Dmax
97 12v 4x4 sold
01 24v 2wd needs more go fast goodies
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09-14-2013, 09:27 AM
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#15
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Name: 12vriviera
Title: That Guy with that car
Status: Not Here
Join Date: Mar 2009
Location: north texas
Member`s Gallery
Posts: 6,846
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My buddy had this same issue, installed a check valve at outlet of fuel pump, issue is gone..
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09-14-2013, 09:33 AM
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#16
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Name: Levi_plummer
Title: Too Much Time
Status: Not Here
Join Date: May 2012
Member`s Gallery
Posts: 346
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If you know everything why are you coming hear for advice? You keep answering your own questions,
__________________
92 W250 sclb. "Jinny" 962/1472. 7.08@98mph RIP..
96 sclb 4x4 new racetruck in the making
97 sclb 4x4 tow rig
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09-14-2013, 06:18 PM
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#17
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Name: TxDiesel007
Title: Uncommon CR problemed
Status: Not Here
Join Date: Jul 2007
Location: South Texas
Member`s Gallery
Posts: 1,648
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Quote:
Originally Posted by Signal 73
Man some people reply without reading
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ok ill admit..
this was my bad.. im sorry to the OP and to yourself... no offense taken from either comment... ill try to better read next time..
__________________
05 3500 auto 4x4
95 2500 5 spd 4x4
HUGE thanks to Dan and the boys at Valair Inc Clutch and Gomer at onesourcetruckaccessories!
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09-14-2013, 07:03 PM
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#18
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Name: country_hick
Title: Green Behind the Ears
Status: Not Here
Join Date: Aug 2012
Member`s Gallery
Posts: 42
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Your system is not stock. I read that part.
I would look at all of your connections on your fuel lines. Perhaps a clamp is loose causing an air leak. This sounds like a normal air leak issue.
There is also a possibility that in your modded system you have an anti-flow back valve that is leaking internally. Over time it could drip enough to let the system lose its fuel back into the tank.
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