i believe it should be around 6 psi that's what mine was at after i installed my new pump
The mechanical fuel pump regulates the fuel pressure. This truck is not fuel injected. It has a carburetor.
Fuel injection pump
With mechanical, cam driven fuel pump, about 3-5 psi.
Fuel pressure can range from 39 PSI to 52 PSI in a properly operating system.
The 1974 Chevy truck has a mechanical fuel pump with a built in pressure regulator.
Mechanical fuel pump will develop about 2 psi.
Mechanical fuel pump will develop about 2 psi.
you would also need to replace both intake and exhaust manifolds. also, does the new head have a provision to power a mechanical fuel pump? The 2 valve per cylinder head has a shaft driven off the back of the camshaft to power a mechanical fuel pump. I know later samurais used fuel injection, so they needed a more powerful fuel pump and did not have the mechanical low pressure fuel pump that would deliver fuel to a carb.
there is a fuel pressure regulator at the end of the fuel rail.It works with a combination of vacuum applied to it and approx. 60lb of fuel pressure that is regulated to apprx. 38 lb. when operating right. The excess fuel /pressure is sent back to the fuel tank via return line.I am not seeing a fuel pressure "sensor" on this vehicle.
If you are running the fuel injection....absolutely not. No mechanical pump will provide the fuel pressure needed to run it. I don't even know if the 93 still has the mechanical fuel pump mount. Even if it did, the camshaft wouldn't have the fuel pump eccentric to run the pump.
That vehicle has a mechanical fuel pump and a carburetor. The fuel pump has a built in regulator and is not serviceable.
When I put a fuel pressure regulator between my stock fuel pump and carb, I found about 5psi gave me good results