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Re: Vapor Lock cures?
[Re: ireland383]
#1498442
09/08/13 06:51 PM
09/08/13 06:51 PM
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Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
rowin4
master
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master
Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
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Basically vapor lock is pressure built up from heated gas in you carb/fuel system. Anyway that you can get rid of the heated gas or overcome the pressure you will solve the problem. As stated above, recirculate the gas back to the tank, Instal a electric fuel pump, insulate the fuel line so they don't get hot , run the fuel through a cooler. Last resort put clothes pins on the fuel line as a heat sink. Looks funny but it works. 
it's ok to butt heads, just don't do it with a butthead
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Re: Vapor Lock cures?
[Re: TJP]
#1498445
09/09/13 08:31 AM
09/09/13 08:31 AM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
ethanol based fuel has a lower boiling point hence it is more prone to vapor locking. Several customers have experienced the issue in their older vehicles.
FYI In a test I did with my new Silverado it lost about 2 or 3 miles to the gallon with 10% ethanol fuel. I repeated the test 3 times to confirm the results. The math told me I was paying more per mile with ethanol than with the regular fuel. Food for thought.
Yes that right, but there's nothing you can do about the ethanol because straight gas is way more expensive and very few places sell it now because of the high price. Have you priced straight gas? I thinking no because it's so hard to find. So how do you know ethanol gas cost more in the long run?
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Re: Vapor Lock cures?
[Re: bobby66]
#1498446
09/09/13 09:11 AM
09/09/13 09:11 AM
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Joined: Jan 2005
Posts: 3,344
Central TX
roe
master
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master
Joined: Jan 2005
Posts: 3,344
Central TX
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Are you guys saying a vapor seperator and a return line like used with electric pumps will do the trick? Can the stock pumps keep up the proper pressure with the return line? And where and how do you tie-in the vapor seperator and return lines? This is something I definately need to do to help with a vapor lock issue.
roe
1971 Plymouth Satellite
408/904 8 3/4 3.23 SG
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Re: Vapor Lock cures?
[Re: roe]
#1498448
09/09/13 09:22 AM
09/09/13 09:22 AM
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Joined: Aug 2006
Posts: 8,064
Iowa
76dodgeboy
OP
master
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OP
master
Joined: Aug 2006
Posts: 8,064
Iowa
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Quote:
Are you guys saying a vapor seperator and a return line like used with electric pumps will do the trick? Can the stock pumps keep up the proper pressure with the return line? And where and how do you tie-in the vapor seperator and return lines? This is something I definately need to do to help with a vapor lock issue.
roe
I believe they already have some sort of return. It has the filter with the extra outlet but its blocked. Trucks have them to
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Re: Vapor Lock cures?
[Re: drew72]
#1498452
09/09/13 10:15 AM
09/09/13 10:15 AM
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Joined: Aug 2006
Posts: 8,064
Iowa
76dodgeboy
OP
master
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OP
master
Joined: Aug 2006
Posts: 8,064
Iowa
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Quote:
None of what you said has anything to do with vapor lock. Give the car a tune up and adjust the choke.
Has nothing to do with the choke. You ever have a crappy lean burn setup? They SUCK
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Re: Vapor Lock cures?
[Re: Challenger 1]
#1498453
09/09/13 11:25 AM
09/09/13 11:25 AM
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Joined: Jan 2003
Posts: 15,527
Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,527
Omaha Ne
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Quote:
Quote:
ethanol based fuel has a lower boiling point hence it is more prone to vapor locking. Several customers have experienced the issue in their older vehicles.
FYI In a test I did with my new Silverado it lost about 2 or 3 miles to the gallon with 10% ethanol fuel. I repeated the test 3 times to confirm the results. The math told me I was paying more per mile with ethanol than with the regular fuel. Food for thought.
Yes that right, but there's nothing you can do about the ethanol because straight gas is way more expensive and very few places sell it now because of the high price. Have you priced straight gas? I thinking no because it's so hard to find. So how do you know ethanol gas cost more in the long run?
We have both available here. Non ethanol regular is about 10-12 cents more a gallon.
So if we take the test vehicle
10% ethanol regular at 3.50 a gallon, 12 miles per gallon = .2916-- per mile
non ethanol at 3.62 a gallon,
15 miles per gallon = .241333 per mile.
As previously stated I repeated the test back to back through 6 tanks of fuel under the same type of driving conditions. The results were very close each time 
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Re: Vapor Lock cures?
[Re: 76dodgeboy]
#1498454
09/09/13 02:28 PM
09/09/13 02:28 PM
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Joined: Jul 2005
Posts: 1,954
Blairsden, CA
Triggerfish
top fuel
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top fuel
Joined: Jul 2005
Posts: 1,954
Blairsden, CA
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First, the ethanol laced gas here in Reno is kr_p. The Shaker on my hemi kept the fuel line to the carbs so hot, I could barely touch it.
No return line & it left me stranded many times in August 100 degree temps. Solution was the factory hemi/6 pak, vapor separator & return line & it never locked again.
Challenger 1 is also right in that my 70 Power Wagon's 383 mag started
to do the same thing & I assumed 'vapor lock'. Re-routed the fuel lines
away from heat & it still locked. I have the same NAPA 3 way filter shown in one of the replys & when I pondered over the lines I re did,
I realized the filter was installed BACKWARDS & flowed in the wrong
direction, AND, the small rubber line from the hardline to the filter
was old, weak & collapsing. Turned the filter around & fixed the rubber hose. Viola, no more problems & engine runs much cooler after fixing the lean condition. I'd suggest the factory vapor separator setup & also check the condition of any rubber fuel hoses in your line.
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Re: Vapor Lock cures?
[Re: Challenger 1]
#1498456
09/09/13 11:24 PM
09/09/13 11:24 PM
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Joined: Jul 2012
Posts: 102
pensacola, fl
53fopar
member
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member
Joined: Jul 2012
Posts: 102
pensacola, fl
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Quote:
Vapor lock occurs at the inlet of the fuel pump when the liquid gas turns to vapor because of a restriction in the inlet line to the pump.
Nothing more...it has nothing to do with heated carburators or under hood heat.
Bone stock? You need a new clean sock(strainer)on your fuel pickup in the tank if you really had vapor lock.
I just went through the same issue and Challenger 1 was right. Save yourself some time and check the fuel tank first.
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Re: Vapor Lock cures?
[Re: 53fopar]
#1498457
09/11/13 12:47 AM
09/11/13 12:47 AM
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Joined: Jan 2011
Posts: 15,938
Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 15,938
Central Florida
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I went thru this with my '89 Diplomat AHB stock 4 barrel police engine. It originally had an additional electric pump in the tank but somebody in the past had removed it, and I didn't think it was vapor lock. Tank was removed and cleaned, lines blown out, carb rebuilt and properly adjusted, THREE different fuel pumps were tried. Then thank goodness, a member here suggested I block off the return line on the filter (line that comes off the side of filter). So I took it to my mechanic. He put a fuel pressure gauge on it, and it was jumping erratically at idle and even above. It would go from 0-pegged. He then blocked off the return line, and it immediately steadied right where it should be. He repeated it several times, and each time the same thing happened. So he blocked it permanently and 2 months later I have had no problems. I was so happy it was fixed. I tried chasing this down for months.
Facts are stubborn things.
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