46 Mercury Issues that test me

[RayDon]

1946 Merc.
12 volt conversion with solid state ignition, electric fuel pump,disk brakes front.
car has sat a while, running fine when i put it away. Starts right up , idles great.
When Accelerating, backfires through exhaust, great sucking noise thru carb like its choking out, sputters and dies. have not rebuilt carb. Suggestions please.

[Admiral]

Just a stab in the dark, but if it's making a sucking sound that could indicate a vacuum leak of some sort.

[51 MERC-CT]

Because you have solid state (electronic) ignition. If you don't have spiro-wound spark plug wires similar things can happen.

[RayDon]

Thanks for your response. No vacuum leak that I can find. I think the next step is to rebuild the carb.

[RayDon]

Originally Posted by 51 MERC-CT

Because you have solid state (electronic) ignition. If you don't have spiro-wound spark plug wires similar things can happen.

Correct plugs had been installed at the time of converting. As mentioned, car ran well until i put it away. I believe a Carb rebuild is in order. Thanks

[HDowse]

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It sounds a lot like my car did before CharlieNY rebuilt the carb. My accelerator pump wasn't working at all, really stumbled on acceleration, smoothed out if you feathered the accelerator as speed picked up.

[scooder]

Originally Posted by RayDon

Correct plugs had been installed at the time of converting. As mentioned, car ran well until i put it away. I believe a Carb rebuild is in order. Thanks

It's the plug wires that need to be Spiro wound or resistive, with these fangled electronic ignitions.
Martin.

[51 MERC-CT]

Originally Posted by RayDon

Correct plugs had been installed at the time of converting. As mentioned, car ran well until i put it away. I believe a Carb rebuild is in order. Thanks

Was not referring to 'plugs' but plug 'wires'.
And then again it could be float level or accelerator pump.
This is an excerpt from a Mallory Unilite installation instruction sheet.