Getting closer
Posted: Fri Sep 06, 2019 11:50 am
I FINALLY found why my Hack is fuel starved and I almost don't believe the reason why.
The carb which was relatively new and a known good source and not one of my own rebuilds turned out to be the evil one. It had checked out fine on the bench during all the foibles and red herring work sessions. A while back when the carb was cleaned as part of problem sorting, I noticed it had a Grosse Jet valve which surprised me as I've never had one before, and never thought to ask the rebuilder as surely he would be a needle and seat guy? No issue, just the thought. So now still fuel starved, I take the carb off again, open the fuel line and it flows like a river, turn that off and take the bowl off and lift the float while looking through and see the ball go up and down. Problem must be in the valve body.
Out comes the jet, carb passes air great...go figure. Jet back in, no flow even with the ball appearing open. Off comes the jet and poke thru the body with a 3/16 bit, blow and my golly, it's almost a whistle with free flow. Long story short and a few episodes later, the ball goes up and down...sometimes opens a few thousandths more! %#$%#$%#$%#$%#$%#. It only flows when ALL the way open and its clean.
I think I know the answer, but right now I don't have a needle and seat on the shelf.
Is there something I am missing on a Grosse Jet that would make it behave as it does? Something that I can 'fix' for now to get by?
The carb which was relatively new and a known good source and not one of my own rebuilds turned out to be the evil one. It had checked out fine on the bench during all the foibles and red herring work sessions. A while back when the carb was cleaned as part of problem sorting, I noticed it had a Grosse Jet valve which surprised me as I've never had one before, and never thought to ask the rebuilder as surely he would be a needle and seat guy? No issue, just the thought. So now still fuel starved, I take the carb off again, open the fuel line and it flows like a river, turn that off and take the bowl off and lift the float while looking through and see the ball go up and down. Problem must be in the valve body.
Out comes the jet, carb passes air great...go figure. Jet back in, no flow even with the ball appearing open. Off comes the jet and poke thru the body with a 3/16 bit, blow and my golly, it's almost a whistle with free flow. Long story short and a few episodes later, the ball goes up and down...sometimes opens a few thousandths more! %#$%#$%#$%#$%#$%#. It only flows when ALL the way open and its clean.
I think I know the answer, but right now I don't have a needle and seat on the shelf.
Is there something I am missing on a Grosse Jet that would make it behave as it does? Something that I can 'fix' for now to get by?
Go with Ford. 