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qiksix 10-03-2007 04:19 AM

Just put together a sbc in a street/strip car , now we have noticed the fuel pressure gauge bouncing. 950 demon carb with magnafuel prostar 500 pump with adjustable pressure and 2 port regulator. checked everything for dirt or sticking bits but still does it, anyone had this happen before, still haven't ruled out faulty gauge(new).

mytmouz 10-03-2007 10:15 AM

If it's a liquid filled gauge, that's most likely the problem.

qiksix 10-04-2007 03:14 AM

It's an autometer but not liquid filled, i'll try a different gauge and see what happens.

SST4530 10-04-2007 01:07 PM

If it's not the guage, check for flow through the filter or obstructions at the fuel bung . I've seen pump cavitation (sucking air) cause this same scenario. Also how large are the inlet and oulet fuel lines. Never have a smaller inlet than outlet. Just my $.02

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