Won't start after a month - Troubleshooting
#1648689
07/20/14 01:33 PM
07/20/14 01:33 PM
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Joined: Jul 2003
Posts: 1,212 Canton, Ohio
Crazy68Dart
OP
pro stock
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OP
pro stock
Joined: Jul 2003
Posts: 1,212
Canton, Ohio
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The Dart was running about a month ago. Been doing some things in the interior, headliner, trim, etc.
Went to start, and nothing. Nothing changed, so puzzled I started trouble shooting. Dizzy is mag trigger Accel, with older 6AL and Blaster 2. Tested ignition by placing coil wire near ground and triggering with jumper wire. Hot blue spark. Then took timing light and made sure plug is firing during cranking, it is.
Looking at carb, not much of a pump shot when hitting the throttle. Remove sight plug, front bowl is empty. Remove secondary tight plug, there is some fuel in there. Carb is Holley 750 DP.
What should I expect in terms of fuel in the bowl? Does it evaporate quickly? Since there was still fuel in secondary bowl, makes me think needle/seat is seeping in primary?
I am using a mechanical fuel pump.
Prior, car started easy, barely have to hit the starter, but this is after fuel/etc. was pulled up to the carb. Appears I have a fuel delivery issue now.
Thanks.
383, Hemi 4-Speed, AlterKtion, D60
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Re: Won't start after a month - Troubleshooting
[Re: Crazy68Dart]
#1648690
07/20/14 01:45 PM
07/20/14 01:45 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I'd fill the pri bowl via the bowl vent till it dribbles out the site plug then let er rip
live every 24 hour block of time like it's your last day on earth
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Re: Won't start after a month - Troubleshooting
[Re: dd340]
#1648693
07/20/14 02:32 PM
07/20/14 02:32 PM
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Joined: Jul 2003
Posts: 1,212 Canton, Ohio
Crazy68Dart
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Quote:
Quote:
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I'd fill the pri bowl via the bowl vent till it dribbles out the site plug then let er rip
That is the plan... however I don't want to have to do that every time the car sits a month. Should I pull the carb and let it sit on the bench and watch for leaks?
Carter and edelbrock carbs are notorious for this, but I think holleys are much better. You could run an electric fuel pump.
I don't think it is pump related. Rear bowl had fuel, front bowl did not. I have not noticed any external leaks, so I am assuming it was leaking inside the intake.
If it was an evaporation issue, I would think that the rear bowl would be empty too after this period of time?
Been reading that a pinhole in pump diaphragm or damaged power valve can cause this (possibly)?
383, Hemi 4-Speed, AlterKtion, D60
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Re: Won't start after a month - Troubleshooting
[Re: Andrewh]
#1648695
07/20/14 04:52 PM
07/20/14 04:52 PM
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Joined: Dec 2004
Posts: 10,558 Rittman Ohio
fourgearsavoy
I Live Here
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I Live Here
Joined: Dec 2004
Posts: 10,558
Rittman Ohio
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I would look into the front power valve and gasket just for any fuel residue on the vacuum side of the PV. That being said my PV and gasket are in good shape but my bowls will go dry after a month of inactivity. Your 750 may not have a power valve in the secondary bowl so you may have an issue. I would change the valve and replace the gaskets with a set from Superformance because they don't leak or wick fuel. Gus
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60
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Re: Won't start after a month - Troubleshooting
[Re: Crazy68Dart]
#1648696
07/20/14 05:06 PM
07/20/14 05:06 PM
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Joined: Apr 2010
Posts: 4,154 bethlehem pa
mikemee1331
master
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master
Joined: Apr 2010
Posts: 4,154
bethlehem pa
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Quote:
Quote:
Quote:
Quote:
I'd fill the pri bowl via the bowl vent till it dribbles out the site plug then let er rip
That is the plan... however I don't want to have to do that every time the car sits a month. Should I pull the carb and let it sit on the bench and watch for leaks?
Carter and edelbrock carbs are notorious for this, but I think holleys are much better. You could run an electric fuel pump.
I don't think it is pump related. Rear bowl had fuel, front bowl did not. I have not noticed any external leaks, so I am assuming it was leaking inside the intake.
If it was an evaporation issue, I would think that the rear bowl would be empty too after this period of time?
Been reading that a pinhole in pump diaphragm or damaged power valve can cause this (possibly)?
the electric pump was suggested because you wouldn't have to crank and crank to fill the bowls after sitting. just flip a switch. but there are issues with electric pumps too but mostly noise and pressure. I would just accept the fact you're going to have to crank it a few 'extra' times after sitting for a long while.
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Re: Won't start after a month - Troubleshooting
[Re: mikemee1331]
#1648697
07/20/14 06:27 PM
07/20/14 06:27 PM
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Joined: Jul 2003
Posts: 1,212 Canton, Ohio
Crazy68Dart
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Canton, Ohio
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Mike, thanks. Yeah, I understand the electric pump suggestion thinking about it some more. Maybe a "prime pump" to get it going and then let it run on the mechanical.
Gus, yeah, no PV in the secondary on this carb. I'll likely pull the primary side apart. I don't really want it leaking fuel into the engine if that is really what is happening. I am using the blue gaskets, and see no indication of leaks externally.
Either way, I got it running. Filled the bowl and it lit right off.
While I was looking at the electrical/ignition side of things the secondary side of the MSD Blaster 2 is showing almost 11 K Ohms of resistance. MSD says it should be approx 4.6 K. Primary side is close to spec at .9 versus the .7 spec.
Just wanted to run this past you guys. Coil is firing so I am going to leave well enough alone.
383, Hemi 4-Speed, AlterKtion, D60
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Re: Won't start after a month - Troubleshooting
[Re: Jeremiah]
#1648703
07/21/14 11:07 PM
07/21/14 11:07 PM
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Joined: Jul 2003
Posts: 1,212 Canton, Ohio
Crazy68Dart
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Well, about 27 hours between the photos. Started with 60 milliliters and am sitting at 25 right now. Granted, this is a completely open container and was in my shed with the mowers which was likely 85-90 degrees today. However, I can see this being accelerated dramatically when an engine heat soaks.
383, Hemi 4-Speed, AlterKtion, D60
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Re: Won't start after a month - Troubleshooting
[Re: Ronnman]
#1648708
07/22/14 10:50 PM
07/22/14 10:50 PM
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Joined: Jul 2003
Posts: 1,212 Canton, Ohio
Crazy68Dart
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Canton, Ohio
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So now 24 hours later.. down to 20 ML. The evaporation has certainly slowed down a lot, and it was hotter today than yesterday.
383, Hemi 4-Speed, AlterKtion, D60
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