Christopher G. Moog wrote:
>
> You should check the gulp valve, if this is OK check for exhaust leaks
> and the ignition system. The gulp valve is the most likely cause. The
> valve is suppose to stop the outlet of the air pump from going to the
> exhaust when decelerating.
Thanks for the input Chris. I had just installed a new exhaust system
with new manifold gaskets all around, so probably not the exhaust. And
I tried it without the gulp valve and air pump without a change. It is
not a deceleration backfire, but one that comes on during hard
acceleration.
If I open up the jets it finally goes away, but I must be running rich
as hell. I'm wondering if it has something to do with the way my fuel
pump seems to be acting. I used to turn the ignition on and I could
hear the pump run aggresively, filling the float bowls, then it would
quiet down after a couple of seconds. Now it seems to be pumping hard
all the time, but I don't have any trouble starting the engine. It is
not a standard SU pump, but something the DPO put in himself, I believe
an AC-Delco electric pump. Seems to me that all this might point to the
carb floats and needle/seat?
Wally / Templeton, MA
71 MGB (with case of angina)
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