Re: TrevorK's 1955 Packard Patrician

Posted by BigKev On 2017/7/21 12:03:03

My accel pump blew out the side of it. (see my recent blog entries about this).

The cause of this was not driving it for about 9 months which caused the brass "plumb bob" like check valve between the pump and the jets to varnish in place. So with that, you're now trying to compress a liquid, and the varnish was stronger than the leather pump. So it blew out the side of the pump enough so that the leather caught on the housing and repeated pumping kept tearing it.

On my car, I could start the car, but any accel would pretty much cause it to stumble and die. While it was driving it would still stumble but not die, but from a standing stop, I had to baby it to get it rolling, or it would die.

After clearing out the varnish, and installing a new pump, it's all good. Also, you could have clogged Accel Jets which could cause the same blowout.

The pump that blew out was from Daytona, and was leather, and was about 4 years old, but only have 500 miles on it. The stuck check valve caused the blowout, not a defective pump itself.

Pull off the air cleaner, hold open the choke plate and look down to see if the accel jets are both squirting when you work the throttle.