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Originally Posted by 78w72
Nothing wrong with using a primer pump for this type of issue if you have already changed everything for new... and dont want to invest any more time tracking down the cause.
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Difficulty of diagnosing the cause is the challenge here, not the time. If there was a non-invasive and simple way to measure the seal on the pump check valve, this thread wouldn't exist. Similarly, if there was a non-invasive way to directly measure fuel inside the carb bowl, it would help. I measured my carb temperature, it's not excessively hot.
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2 days does seem like there could be more than just evaporation going on, especially at only 45°... but a pusher pump will be a fix or band aid to get around whatever the problem is.
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It takes a long time to cool down after shutting off so the residual heat is certainly a big contributor.
Several on the forum with direct knowledge and years of experience have chimed in and convinced me it's normal and it's evaporation.
A search found this 15-yr-old thread with the same info but lots of supporting statements:
https://forums.maxperformanceinc.com...ight=fuel+pump
I will say CO gas is now regulated to a lower RVP... like 7 to 9, depending on how the rules get bent.
Also, my car is filled with ethanol-free gas. I have no facts, but perhaps it is more volatile than typical pump gas ?? Anyone ??
Thank you for the link. That's a good price for a name-brand solenoid pump.
I'm going to use one of the Purolator/Facet Cube pumps shared earlier in the thread by Kenth. I won't be doing this for a couple months but that's the plan.
Mike