Universal fuel pump regulator

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This Bad Demon

This Bad Demon

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Hey there. I'm using an in tank electric fuel pump with an universal fuel pressure regulator (carb/efi usuage). I've searched and searched but couldn't get a good answer. If I leave the vacuum port to atmospheric pressure it reads round 6 psi where I set it for carb usage. If I hook the line up to manifold pressure it drops to 4 psi. Should I leave it to atmospheric pressure or to manifold pressure? Also when it's hooked to manifold pressure it dips a lil when given gas... Is that normal?
 
Yes, the dip in the pressure is normal. I would plug the regulator vacuum hose to manifold vacuum and set the regulator to 7 PSI to compensate for the drop in pressure under full throttle.
 
Demonracer said:
Yes, the dip in the pressure is normal. I would plug the regulator vacuum hose to manifold vacuum and set the regulator to 7 PSI to compensate for the drop in pressure under full throttle.
Click to expand...
Ok so you suggest not having the hose hooked up at all? Like how I had it before....
 
The Vacuum / Boost reference port is provided for fuel pressure compensation at a 1:1 rate, this is primarily used in blow-thru centrifugal supercharged applications. In most cases this port is left open to reference atmospheric pressure
 
Use the port. That’s what it’s for. It will lower fuel pressure while at a cruise.

It will clean up your cruise AFR a bit.
 
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