Hey guys. How do I tell which fuel regulator I have. A block style or a bypass style. I have a standard tank for a 56 Chevy truck, a street demon carburetor, and a holly mechanical fuel pump. I bought the regulator with no paperwork. I've looked at both types and they both have 3 ports a gauge a vacuum port and adjusting bolt. My tank has no place for a return line, so if I have a bypass type can I block off the return lone port. Any help is welcome. Thanks guys. Sent from my SM-G920V using The H.A.M.B. mobile app
You'll need to identify whether it's a bypass reg or not. Even a non bypass may have 3 ports, one in and 2 out, so it would be wrong to assume there's a return, just because there's 3 ports. Pics would help id the item i expect. I can't imagine blocking off the return on a bypass type will work as sending the excess down the return is how they work. The non bypass just seem to block the flow, and make a loud hammering noise when they do that. Well, that's my experience! Chris
Very likely you don't need any regulator with the mech fuel pump, what is the holley number? A bypassing regulator will have identified ports, it'll say 'bypass' or 'inlet' as part of the casting, it should not have a vacuum port as those are for fuel injection/turbo application that are boost referanced to raise pressure along with boost pressure and not a vacuum port at all, they are also 'bypass' type.
It has a port on the left and right and o e on the bottom. It cam in the repackaging with a plug screwed onto the port on the right. I have a 680cfm street demon carb. The Allen plug in the front is where the gauge goes. Sent from my SM-G920V using The H.A.M.B. mobile app
Both ports on the sides have the same size moon shaped hole inside where the one on the bottom is almost blocked except for a small hole about about 1/8 in diameter. Sent from my SM-G920V using The H.A.M.B. mobile app
has an Aeromotive look about it - pic stolen from the interweb - might help narrow down your search for instructions.
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