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At 09:02 AM 7/30/2003 -0700, you wrote:
--- Fly Bum <fly_it_slow@yahoo.com> wrote:
> Trying to help a friend get his recently purchased
> 2nd
> gen running. He has a street ported 13b with a
> weber
> copy side draft carb. The engine starts and runs
> fine
> for about 3 minutes and then it starts
> backfiring/popping (a little) and loses power and
> quits. Let it sit for a while and it will start
> back
> up and run ok again for another 3 minutes.
>
> I don't think it's the fuel pump cutting out since
> he
> has it hardwired on and it seems to be putting out
> plenty of flow.
>
> What else to look for?
>
> Thanks guys!
>
> Joa
>
>
Sounds like fuel starvation. If he is using old fuel
line hoses, sometimes they will crack on the inside
and under pressure the cracks will partially close off
the line.
John
Joa,
While not a Mazda "expert" myself, I second the fuel starvation diagnosis. However, I would disassemble the carb and check it out closely, or rebuild it. I suspect it has been sitting for a while and the needle & seat, and possibly the jets are gummed up from old gas. I have this problem all the time with my boat's carburetor after sitting all winter.
Mark S.
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