Thanks to all for their suggestions.
Bob, you set me on the right track. After changing pressure regulator
settings and filters to no avail, I replaced the fuel pump and it runs like
a dream!
Question to all: The new centrifugal pump says "2.5-4PSI" on the box.
Doesn't this mean I can eliminate the pressure regulator from my Weber
downdraft setup?
Bill
----- Original Message -----
From: "Bob Howard" <mgbob@juno.com>
To: <wcameyer@email.msn.com>
Sent: Wednesday, June 28, 2000 2:05 PM
Subject: Re: Hesitating/backfiring
> Bill,
> Check the venting to the gas tank. In addition to ignition things you
> check, the expansion of the gas during hot weather after a drive can
> overwork the vent system if it's not clean. If it floods into the
> charcoal cannister it's obvious, but if it only partly obstructs you can
> get baffling problems like this.
> Bob
>
>
> On Tue, 27 Jun 2000 10:50:03 -0700 "wcameyer" <wcameyer@email.msn.com>
> writes:
> > Hello, List:
> > I need help. Twice recently I've driven 10-15 miles, my '77 B rdstr
> > running
> > beautifully at speeds up to 85. Then it is parked for 1/2 to a full
> > hour.
> > On the way back, after a while, it will hesitate, buck like H---,
> > and
> > possibly backfire between 60 & 70. On Father's Day, it ran like a
> > top for
> > 200 miles at speeds up to 90. Standard engine, Piper 270 cam, Weber
> > downdraft.
> > What's going on here? What should I check?
> >
> > Bill
> >
> >
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