Page 4 of Fuel Pumps by Holley Performance Products, Inc.

fuel pumps technicalinform at i o n fuel pumps regulator technical information flow chart for externally mounted electric fuel pumps ground holley electric fuel pump solenoid nc starter motor coil p/n 12-810 oil pressure switch no to accessories oil pressure safety switch it s always a good idea to place a safety switch in the circuit when installing an electric fuel pump holley has one available under p/n 12-810 this switch will ensure that the electric pump will not work unless the engine has oil pressure it will prevent the pump from running in a situation where the motor may stall with the ignition on wiring the switch through the starter solenoid circuit energizes the pump on engine start-up after the engine is running the switch continues to provide power to the pump as long as there is oil pressure to keep the switch turned on see illustration c ignition switch to distributor battery fuel pressure gauges there are a number of places where mechanical fuel pressure gauges could be effectively mounted one place is just before the carburetor holley chrome dual feed fuel lines except model 4500 dominator and fuel blocks all have a tapped 1/8 npt provision for this purpose another would be at the outlet side of the pressure regulator the holley four-port pro-series volumax regulator incorporates two pressure gauge taps expressly for this purpose the electric fuel pressure gauge can be mounted inside the vehicle so that fuel pressure can be monitored while driving this is possible because unlike the mechanical gauges fuel does not flow up to the gauge itself the holley electric gauge p/n 26-503,utilizes a remote sending unit which is the primary fuel pressure sensor holley offers a variety of fuel pressure gauges depending on use for carbureted vehicles there are two 2 mechanical and one 1 electric gauge available in the 0-15 psi range vehicles equipped with low pressure up to 30 psi fuel injection systems like throttle body fuel injection systems can choose from two mechanical pressure gauges in the 0-30 psi range fuel pumps 192 www.holley.com

[close]