Thermoquad Rich Idle

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How about to much fuel pump pressure?
Well very few motorcycles have pumps and the ones that do are low-pressure, usually no more than 3 or 4 psi.

But Ima thinking your question is in regards to automobiles.

Yeah that can be an issue, the factory 2bbl pumps are good to 4.5psi, and the 340s are about 6.5 maybe a tad more. But the TQs have always worked for me up to whatever the P4007040 puts out, (advertised at [email protected]), in your application. The TQ cover, inverted,with the brass floats, will usually blow a seal at around 5psi. If it holds at 4psi for 5 minutes or so,, I've never had a comeback.
If it doesn't, I'm looking for the reason.
'course the floats actually have to float........ in gasoline, and not accumulate liquid inside..