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Vapor lock on Ford 600

C

Charles Krammin

Member
While plowing and discing on a 90 degree day this week, with the Ford 600, I experienced "Vapor lock". Openned gas cap (vented and no noticable presure) and could visualised bubbles coming out of tube for sediment bowl, in bottom af tank. Also could get off tractor and walk around it (either direction (Ha-Ha) and vapor lock would subside.
Do the Marvel-Schebler carburetor, have a outside vent, above the float that could be plugged ? Is the vent by the butterfly in the air tube and be wired out without dismantling carb body?
Michigan subsidize "Ethanol" Does this type gas vaporise at a lower tempature?
12 volt electrical system has 12 volt coil and ballast resistor and new distributor and coil and points and good advance, so have ruled this out as a problem.
Motor recently completely rebuilt.


Charles Krammin, OT, SW MI
 
might have boiling gas / line too close to manifold. ethanol don't help any...

are your oem heat shilds(s) in place?

soundguy
 
(quoted from post at 17:11:36 06/10/11) While plowing and discing on a 90 degree day this week, with the Ford 600, I experienced "Vapor lock". Openned gas cap (vented and no noticable presure) and could visualised bubbles coming out of tube for sediment bowl, in bottom af tank. Also could get off tractor and walk around it (either direction (Ha-Ha) and vapor lock would subside.
Do the Marvel-Schebler carburetor, have a outside vent, above the float that could be plugged ? Is the vent by the butterfly in the air tube and be wired out without dismantling carb body?
Michigan subsidize "Ethanol" Does this type gas vaporise at a lower tempature?
12 volt electrical system has 12 volt coil and ballast resistor and new distributor and coil and points and good advance, so have ruled this out as a problem.
Motor recently completely rebuilt.


Charles Krammin, OT, SW MI
Click to expand...
appy to see you put "vapor lock" in quotes, because by definition vapor lock occurs on the suction side of a fuel pump which you do not have such on that tractor. Boiling fuel perhaps? Yes ethanol boils at significantly lower temp than gasoline, so 10% will lower the b pt for the mix a bit.
"Is the vent by the butterfly in the air tube and be wired out without dismantling carb body?' no.
A "True" 12v coil needs no ballast & should not have one installed. If "true" 12v coil it will have primary resistance around 3 ohms.. If it is around 1 1/2 ohms, then use the ballast.
 
Thanks JMOR and soundguy
Will change my termenlogy to "boiling fuel"

Will get rid of ballast resistor on 3.2 ohm coil. Installed it as I was not sure of JD F-145 power unit off old JD 45 combine, had a resistance wire from switch and thought it helps more fully protect ignition items , especially points.
All standard heat shields in place and only sediment bulb filter and no after market filter.
Will check on plugged carburator vent as possible cause, by dismantentling. Believe it is in air intake before butterfly. believe it was chemicaly cleaned, at recent overhaul.
BTW, Got 20 acres of CRP seeding done. "Ole" 1951 DC Case, did most of heavy duty work Oil presure dropping to 25# at near 190 tempature, with radaitor lovers cranked fully open, however this 1937 body and seat end, took quite a beating ( even with seat cushions), over fall chisel plowed ground. Also I looked like coal miner when done. Also used a 1950 JD drill.
Those "modern day air conditioned rigs" farmers,sure got it easy.
I think I will retire, for good, this second time.

OT Charles Krammin
 
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