Quote:
Originally Posted by tjc1965
I'd do that, but I'm concerned about damaging the existing working mechanical pump by feeding it 4-5 psi all the time. Or worse, causing an issue at the carb by making the feed pressure downstream of the mechanical pump higher ( electric pump + mechanical pump = 8-9 psi?) Or maybe I'm overthinking it?
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Your pressure would be the highest of the two, not the sum of the two.
I have an additional idea as to why the new pump seems to cause stalling: Your plumbing to and from the new pump may be sucking air. If you are using the supplied spring clamps that come with many pumps, ditch them and use warm gear clamps.
I would mount whichever electric pump you wind up with closer to the fuel tank, wire it the same as it is now, but with an additional normally off toggle that you can pull when you feel it is about to stall, which may happen occasionally due to vapor lock at a stop light.