Set fuel pressure

[ThomasP]

I have trubble with my fuel pressure.

I set my fuel pressure to 7psi without vacum.
Put on the vacumhoose and it should drop to 4psi.
Under full gas it should be 12psi + my boost (10psi)

My problem is that I drop fuel pressure and boost.
I have tighten the belt and tried whitout surge valve.

Maybe I set my fuelpressure wrong.
How should I set it?

My vacuum from the regulator is under the carb as my surge valve.

Very greatful for help!

[Sponge]

If there is no boost, the fuel pressure should stay at 7psi, right? why does it drop to 4psi?

I hope SMRE crew will help you!

[ThomasP]

Should I set my fuel pressure at 7psi with or without vacuum?

I have set mine whitout. When I put on the vacuum and cruiseing my fuel pressure drops to 4psi.

[DART340SC]

If you are talking about your fuel regulator, it should not be connected to boost, not vacumn. As your boost rises, your fuel pressure should rise accordingly, generally 1 lb fuel pressure to 1 lb boost

[ThomasP]

If you are talking about your fuel regulator, it should not be connected to boost, not vacumn. As your boost rises, your fuel pressure should rise accordingly, generally 1 lb fuel pressure to 1 lb boost

Boost or vacum?

[DART340SC]

Boost