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The horsepower is limited on the GM TBI engines by injector size and fuel pressure. This regulator assembly allows the use of higher than stock fuel pressures on the standard injector. Standard fuel pressure is 9-13 psi, our unit includes a 17 psi spring (use of a non stock fuel pump required). The fuel delivery is modulated by intake manifold vacuum to help the engine run cleaner at low speed and at idle. Every 2.5 in of vacuum applied to the regulator lowers the fuel pressure by 1 psi. With a base pressure of 17 psi and 14 in of manifold vacuum at idle, the resulting fuel pressure will be 11.4 psi. Under WOT the fuel pressure will go to 17 psi. Custom chip programming may be required to function properly. This regulator is a “must” for installing a 502 or 498 big block in your 87-93 GM truck. Comes complete with required diaphragm, high pressure spring, spring shims and vacuum fittings.

Recommended fuel pump 635-212 intank replacement 40gph

 

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