Carb Problem
Thread Starter
Drifting
Joined: Nov 2003
Posts: 1,645
Likes: 65
Carb Problem
Anyone ever have a problem with a 3267A needle not being able to hold aganist a hi-performance mechanical Chevy fuel pump. This one has me baffled, tried everything still cannot get an adjustment on the front float that will hold aganist fuel pump.
Help
Charlief
66 Coupe
Float does not leak the only way to stop the bowl from overflowing is to nail the float to the bottom of the Bowl. Then the eventually bowl runs out of gas, its a vicious cycle and I go nuts trying to figure it out.
By the way I have tried new floats, both brass and solid plastic, both react the same.
I have not measured it but if the rear float does not have a problem, isn't the pressure on both needles the same?
Help
Charlief
66 Coupe
Float does not leak the only way to stop the bowl from overflowing is to nail the float to the bottom of the Bowl. Then the eventually bowl runs out of gas, its a vicious cycle and I go nuts trying to figure it out.
By the way I have tried new floats, both brass and solid plastic, both react the same.
I have not measured it but if the rear float does not have a problem, isn't the pressure on both needles the same?
Last edited by tentuna; Aug 31, 2005 at 08:40 PM.
Drifting
Joined: Mar 2005
Posts: 1,300
Likes: 0
From: Iowa
We see this all the time. Install a fuel pressure regulator between the pump and the carb inlet. I recommend the holley regulator. Do not use the cheap push-down-and-turn regulators sold in most parts stores. They eventually leak. locate the regulator as close to the carb as space and heat allows. Set the fuel pressure to 3 psi to start with. The holley regulator has an additional port for a fuel pressure gauge. Even if you do not want to mount it externally, a small gauge in this port comes in handy instead of using temporary test gauges to set/monitor it.
Le Mans Master
Joined: Nov 2000
Posts: 7,246
Likes: 21
From: Going too fast over the hill. Iowa
If it's a brass float, have you checked it for cracks?
I use a 5-7psi purolator pump that delivers almost a gallon per minute (more than Chevy spec) and I have no problems. The chassis service manual tune up spec requires 5-6.5psi from a v8 pump.
How much pressure does your pump put out?
I use a 5-7psi purolator pump that delivers almost a gallon per minute (more than Chevy spec) and I have no problems. The chassis service manual tune up spec requires 5-6.5psi from a v8 pump.
How much pressure does your pump put out?
Last edited by magicv8; Aug 30, 2005 at 02:58 PM.
