Fuel pressure fluctuating??

Fuel pressure fluctuating??

Postby raj4851 » July 15th, 2018, 11:06 pm

I have a 140 Mallory pump & a 4309 Mallory bypass regulator. For about four years or so it kept perfect & steady pressure. Lately it has been erratic. One time it would be up to six pounds when I would start it. After driving awhile it would be down to three or so. I would set it back up to five, where I usually ran it. When I started it again, back up to six. I replaced the regulator diaphragm & it seems to be acting the same way. I posted this on another website & they said this wasn't too uncommon. I still don't think it's right. Any ideas? thanks in advance, Rod

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