Just had a CARB aha moment, and thought I would tell yall
Posted: Fri Aug 07, 2009 10:08 pm
The splash day is almost here (next week) After 5 years on the dry, I decided to rebuild the carburetors on my 318's to eliminate any chance of goo ruining my day. They are Carter AFB units, pretty basic from a carb stand point. Wellllllll.... I got done put them back on, swapped fuel filters, hooked up cooling water, and SHAZAMMMMM... both started up ran beautifully, and idled perfectly.... but, here is the big butt.... after the engines shut off and they sat for 10 seconds or more they started leaking raw gas out the main, secondary jets to the point it oozed out the throttle plates onto the intake manifold, leaving a puddle big enough to raise guppies in. ......
So here is the information for all my friends on trojanboats.net:
I followed the float drop settings from the LM318 manual from marysville marine and set the shut off at 3/16" gap......Well then I read a performance manual on AFB carbs and it stated 7/16" so I tried 3/8 to 1/2" for good measure and guess what........It worked perfect....No drips.
From what I read (dont know how true it is) but the octane and fuel expands more now a days than back in 1970 when the manual was written so when then engine is shut off the residual heat will cause the fuel to expand between the fuel pump and carb float bowl thus burping over into the main and secondary jets.......
Huh go figure.... regardless of the reason, it worked and I didnt follow the directions.....Im gonna go tell the wife to proove I dont always have to follow directions to get things to work right
So here is the information for all my friends on trojanboats.net:
I followed the float drop settings from the LM318 manual from marysville marine and set the shut off at 3/16" gap......Well then I read a performance manual on AFB carbs and it stated 7/16" so I tried 3/8 to 1/2" for good measure and guess what........It worked perfect....No drips.
From what I read (dont know how true it is) but the octane and fuel expands more now a days than back in 1970 when the manual was written so when then engine is shut off the residual heat will cause the fuel to expand between the fuel pump and carb float bowl thus burping over into the main and secondary jets.......
Huh go figure.... regardless of the reason, it worked and I didnt follow the directions.....Im gonna go tell the wife to proove I dont always have to follow directions to get things to work right