Joined: Feb 26, 2011 Posts: 81 Location: Spanish in Venezuela
Posted: Sun Sep 15, 2013 10:39 am Post subject: FUEL PRESSURE
I tried the carburetor YS950 on my 134L and I could not adjust its operation because finally had always drowning.
Recently a friend lent me a new SOLEX carburetor and idle RPM up and down in cycles, similar to a large diesel engine.
In your manual recommends placing a pressure regulator calibrated to 1.75-2 PSI between the fuel pump and carburetor.
As I said I have no regulator, hoses tried to do in "Y" a return to the fuel tank, with a small homemade valve, and too a pressure gauge interspersed near the carburetor.
The initial pressure with the valve closed reaches approximately a 10PSI.
I was opening the return until the pressure gradually fell to the SOLEX manual recommended.
Indeed stabilized idle.
Before pressure testing empirically with 950YS would like to know what is the pressure that the pump must produce fuel for YS carburetors, engine both L 134 and F 134, and if relevant to its operation.
I estimate that if there is too much pressure, this will overcome the float on the needle.
The YS950S is a F134 engine carb. Bore and mount flange are too large for the L134 engine.
The fuel pressure spec for the YS950S on the M38A1 or M170 jeep is 4 1/2 to 5 PSI @ 1800 RPM.
The carb meant for use on the L134 military engine is the YS650S. The fuel pressure spec for that carb in the M38 jeep is 4 to 5 1/4 PSI @ 1800 RPM. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
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