Vapor lock question
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Re: Vapor lock question
Wow thanks for all the info. Ive got alot of things to check I appreciate it.
Dee
Dee
45 Willys MB, MBT, Harley WLA
- tamnalan
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Re: Vapor lock question
Mine does exactly this. If I immediately pop the hood when I turn the motor off and let things cool for a few minutes, then it won't flood.41jeeps wrote:I would first check if it does not flood after shut down.
Many jeeps suffer from leaky floater needles and flood a few minutes after shut down.
So what's the solution? New needle? I don't think it's a dirt problem.
Alan W. Johnson
_______________
MB, 201453, "Lt Bob"
MB, 1942, not stock
M-100, Sep 1951
MB-TD, Mar 2012
Ford 91C, 1939
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MB, 201453, "Lt Bob"
MB, 1942, not stock
M-100, Sep 1951
MB-TD, Mar 2012
Ford 91C, 1939
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Re: Vapor lock question
Anti percolation valve which this carb may not have? or lower the fuel pressure back to specification ....check with your vacuum/pressure gauge, plus check & adjust the float height.Alan offered: So what's the solution? New needle? I don't think it's a dirt problem.
Fuel & carb act as a heat sink & guess what happens?
Expansion perhaps boiling then discharge into the inlet manifold; needle valve opens so more fuel gets into the carb bowl all a progressive process that which contributes to flooding.
John GIBBINS Member Institute of Automotive Mechanical Engineers [Ret], ASE Master Medium/Heavy Truck & Auto Technician USA -2002 Licensed Motor Mech NSW MVIC 49593 Current 2015
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
Understand how system parts interact with one another. GOOD parts can then be established & the NOT GOOD problem/s part/s isolated for repair or replacement.
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
Understand how system parts interact with one another. GOOD parts can then be established & the NOT GOOD problem/s part/s isolated for repair or replacement.
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Re: Vapor lock question
Add Hi Test on hot days.
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- Milo 42 GPW
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Re: Vapor lock question
My jeep did this also and it was that the timing was way off. The carb would get overheated and boil out the fuel when stopped at a long red light and then die when I tried to accelerate at the green light. When I corrected the timing my "vapor lock" went away.
Milo Valencic
Stuart, Florida
1942 GPW S/N# 76157
MVPA # 7500
ADJ2 68-74
http://community.webshots.com/user/milo ... =community
Stuart, Florida
1942 GPW S/N# 76157
MVPA # 7500
ADJ2 68-74
http://community.webshots.com/user/milo ... =community
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Re: Vapor lock question
The original MB/GPW design anticipated vapor lock and incorporated a pressure cap to counteract the tendency to vapor lock.
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
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COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
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Re: Vapor lock question
This topic has come up again and again. You should check some of the other posts on it.
Personally it has only happened once to me - and it was very hot that day on black tarmac. So the jeep stopped running at the lights. 5 minutes cooling down and off she went.
My solution was to add a thermal sleeve (Summet Racing) on the fuel line at that area.
It hasn't happened again.
I really don't think this occasional problem merits changing the fuel pump.
Other people have put pegs on the fuel line to dissipate the heat.
David V
Personally it has only happened once to me - and it was very hot that day on black tarmac. So the jeep stopped running at the lights. 5 minutes cooling down and off she went.
My solution was to add a thermal sleeve (Summet Racing) on the fuel line at that area.
It hasn't happened again.
I really don't think this occasional problem merits changing the fuel pump.
Other people have put pegs on the fuel line to dissipate the heat.
David V
44 MB 356111 "Charlotte" since 21/02/06 - Capstan winch
42WLA 70443 "Lily" since 16/1/10
42WLA 70443 "Lily" since 16/1/10
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Re: Vapor lock question
Sooner or later everyone will experience vapor lock, it is not a serious symptom and it is only temporary, experience and familiarity with your own vehicles starting habits will allou you to recognize and overcome it. Today's lead free alcohol based fuel lends somewhat to the problem, not every tankful acts the same at times.
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
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