Vapor Lock
#836960
10/23/10 10:03 PM
10/23/10 10:03 PM
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Joined: Dec 2007
Posts: 1,639 Brandon, Ms
cornet684me
OP
top fuel
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OP
top fuel
Joined: Dec 2007
Posts: 1,639
Brandon, Ms
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i think i have a vapor lock problem with my 68' 440/727, i have holley 750 vac. sec., with headers, once the car runs , i ran down the street about 3miles and back to the house, the car was idling in my driveway and went dead, wld not start, getting fire however was not getting gas, i thought was a fuel pump, when and bought new fuel pump, when the car dies, the see thru fuel filter has bubbles in it and is not full, once the car cools down for about 5 to mins will crank and run fine tell heated up again, then the fuel filter almost empty and bubbles, i have a 3/8 rubber hose feeding the carb, the only thing i have changed is i switched around the inlet to the back to get the inlet connection away from the dist., i have included a pic. of the set up that i am having the problem with, i was just going to switch it back around, but i thought i wld ask to see if i may have another problem. thanks Randy
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Re: Vapor Lock
[Re: cornet684me]
#836964
10/23/10 11:27 PM
10/23/10 11:27 PM
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Joined: Jul 2003
Posts: 6,167 Maryland
GO_Fish
master
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master
Joined: Jul 2003
Posts: 6,167
Maryland
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for a test, you can just loosen it. When it starts running crappy and the filter is nearly empty, walk back and loosen the cap. If there was a vacuum lock in the tank, loosening the cap should let it breathe and the filter should fill up again and the idle should smooth out.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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Re: Vapor Lock
[Re: cornet684me]
#836970
10/24/10 02:23 AM
10/24/10 02:23 AM
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Joined: Mar 2003
Posts: 9,099 Rogue River, OR
Jeremiah
master
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master
Joined: Mar 2003
Posts: 9,099
Rogue River, OR
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Quote:
do you think that by swapping the inlet to the back of the carb has made this problem?
No I do not. I had a daily driver setup like that for years (in Dallas, TX) and that 440 never vapor locked. I saw it the other day and it's still setup like your with no issues.
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Re: Vapor Lock
[Re: txterry2]
#836976
10/24/10 09:47 AM
10/24/10 09:47 AM
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Joined: Feb 2005
Posts: 5,221 Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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I don't understand why some flip that line, all your doing is making more area for the fuel to get in, it will clear the dist. if you set it up right, its harder running the holley dual inlet line with low profile intakes, i'm sure you can figure something out, i would too get rid of the glass filter, you more then likely have issues in the tank with blockage or in the factory lines, your starveing the fuel pump, i had this happen once, how you can check it (how i ckecked mine) is i pulled off the line from the inlet side of the pump, then install a short hardline & about 2 ft. or so of hose & blew the line to see how hard is was to push all the fuel back in the tank, thats when i realized it was badly clogged, just something to try if the gas cap trick doesn't work.
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Re: Vapor Lock
[Re: cornet684me]
#836979
10/24/10 12:29 PM
10/24/10 12:29 PM
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Joined: Feb 2005
Posts: 5,221 Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
so when i blow on the line, should i not have any resistance, should i not notice any resistance?
Just get a metal Wix in-line, you will feel resistance "some" untill you push the fuel back in the tank & all your blowing is air, then it should be alot easier to blow through, basically just like blowing through a hose pushing water untill it emptys, then its much easier, as you know its "physics", blowing air is alot easier then blowing liguid, but once the liguids out all thats left is air, then it becomes much easier, sure your going to have "some" resistance (even with all air) because its a long line with bends & turns & 5/16 in diameter, but if its clogged/clogging somewhere you'll know it, i'm sure it is because your having a serious issue getting fuel.
Now if you want to check the FP & or (Rod for wear), just stick a long hose in a gas can & run it to the inlet side of the pump, then put the outlet to another gas can & see how much volume it delivers, of coarse its "best" to do this after the engine is warm & the carb is full of fuel, this way it'll idle for a minute or 2, you'll know if thats all good, if so you can rule out the Pump & Rod... Just be careful when messing with fuel, keep it away from fans/electrical ect..
Last edited by joedust451; 10/24/10 12:31 PM.
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