Carburator Fuel "leak down" problem
#1002367
05/29/11 08:28 PM
05/29/11 08:28 PM
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Joined: Jan 2003
Posts: 11,854 Georgetown Ontario Canada
anlauto
OP
I Live Here
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OP
I Live Here
Joined: Jan 2003
Posts: 11,854
Georgetown Ontario Canada
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A customer of mine has a new MP six pack on his 440.
If he leaves the car sit for a week or so, the carbs seem to empty themselves out only leaving enough fuel to MAYBE fire once. Then you crank and crank and crank and crank and crank and nothing happens...
You remove the shaker bubble PITA, and pour gas down and she fires right up and works perfectly fine with all the float bowls adjusted and working properly...
Let it sit again and it's the same process all over again...
What would cause the fuel system to empty out like that ?
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Re: Carburator Fuel "leak down" problem
[Re: ph23vo]
#1002371
05/30/11 10:37 AM
05/30/11 10:37 AM
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Joined: May 2005
Posts: 907 Mississauga, Canada
KARLN
super stock
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super stock
Joined: May 2005
Posts: 907
Mississauga, Canada
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Alan, This is a common problem on 440-6 and 340-6 Holley 2300's. I have the same issue on my T/A. If it sits for more than 3 or 4 days, I have to crank before it fires.
B5 Challenger T/A
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Re: Carburator Fuel "leak down" problem
[Re: anlauto]
#1002372
05/30/11 10:44 AM
05/30/11 10:44 AM
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Joined: Aug 2007
Posts: 1,101 Ont, Canada
moparo
super stock
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super stock
Joined: Aug 2007
Posts: 1,101
Ont, Canada
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I had a problem with the fuel pump rod on a BB. Not hardened and it was wearing out on the cam side.
If the car has not stalled when driving then it is more likly the bowls have emptied when sitting.
performancecarrestorations.com
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Re: Carburator Fuel "leak down" problem
[Re: LimeliteAero]
#1002374
05/30/11 11:36 AM
05/30/11 11:36 AM
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Joined: Oct 2003
Posts: 3,378 KY USA
mopargem
master
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master
Joined: Oct 2003
Posts: 3,378
KY USA
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I also think its evaporation since I pretty much have that problem with all my cars, some worse than others maybe depending on engine cranking speed and fuel pump condition.
68 Polara 500...LL1 Y7 M6X 69 Hemi road runner...X9 X9 M6X 69 A12 road runner....R4 R4 M6X 69 ModTop FLORAL Super Bee...F 70 AAR 'cuda...EW1 EW1 H4X9 71 Duster 340...FJ6 V24 L6X9 71 road runner FC7 V1X M6X9 72 Rallye Charger B5 V1W 74 'cuda 360...KB5 V1X A6X9 08 SRT Challenger #234
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Re: Carburator Fuel "leak down" problem
[Re: mopargem]
#1002375
05/30/11 11:53 AM
05/30/11 11:53 AM
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Joined: Feb 2003
Posts: 8,020 Pangaea
B5 Bee
master
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master
Joined: Feb 2003
Posts: 8,020
Pangaea
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I have the same problem on all my Mopars with AFB, Holley 2300 & 1920, Carter BBD. There is one exception, I have a slant six I run a Holley 2300 500 on, it can sit 4 weeks, pump it twice and it will fire immediately. I have no answer to why the gas doesn't evaporate out of this carb.
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Re: Carburator Fuel "leak down" problem
[Re: B5 Bee]
#1002376
05/30/11 02:57 PM
05/30/11 02:57 PM
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Joined: Apr 2010
Posts: 10,570 Sunny South Florida
Golden-Arm
I Live Here
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I Live Here
Joined: Apr 2010
Posts: 10,570
Sunny South Florida
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i've been wondering, if the "pre-lube" oil set up, that holds some oil under pressure, to pre-lube a high performance motor, could be plumbed into the fuel system? would store a bit of gas under pressure (4-6 psi) and could be used to refill the carb(s) after sitting a while? with the new carbs being aluminum instead of zinc, and gas being corrupted with alcohol, something needs to change. it's sure not going to get any better, if the damned corn growers have their way.
"When Tyranny Becomes Law, Rebellion Becomes Duty"
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