![]() ![]() Merc does not use a relay nor do they have issues with oil pressure switch current issues that i am aware of. CHECK associated wiring, connectors, etc. Use your original plan or acquire a schematic of a electric fuel pump carbed mercruiser and use the OEM parts including the wiring harness.(this is the correct and preffered method). Improper voltage is being supplied to the CCRM, FPDM power supply relay or electronic EC power relay. Measure voltage between the B+ circuit at the FPDM power supply relay harness connector and the battery negative post. Measure voltage between the B+ circuit at the electronic EC power relay harness connector and the battery negative post. Measure voltage between pin 11 (B+) of the CCRM harness connector and the battery negative post. For this reason, order a wiring kit for EACH. Key on (to put same load on battery as previous steps). Radium recommends a dedicated fuse and relay for each fuel pump. KB75 CHECK B+ TO ELECTRONIC ENGINE CONTROL (EC) POWER RELAY (CONTINENTAL), CCRM OR FPDM POWER SUPPLY RELAYĭisconnect CCRM (Escort, Mustang), electronic EC power relay (Continental) or FPDM power supply relay (all others). For example, when a module is powered up and it sends out a signal of half the voltage in addition to the technician would not know this, hed think he offers a problem, as this individual would expect a 12V signal. CHECK for causes of high resistance in FP PWR circuit. To properly read a wiring diagram, one has to know how the components within the method operate. ![]() Can hear the fuel pump relay click when the ECM B fuse is inserted with the ignition in the on position. ![]() CHECK related connectors for corrosion, etc. Did not hear fuel pump running when ignition is only in on position. Is voltage greater than 10.5 volts, AND within 0.5 volt of the reading in KB72? Figure 2 WIRING THE FUEL PUMP WITH A RELAY: NOTE: You will need Holley Fuel pump relay kit P/N 12-753 or equivalent 4-wire relay. To complete the installation, connect the ground (black lead) to the battery. In this line, add an in-line fuse holder and a 7.5 amp fuse. Measure voltage between the FP PWR circuit at the fuel pump harness connector and the battery negative post. Connect the fuel pump (red lead) to a 12-volt ignition source. Connect a jumper wire between the FPDM PWR (VPWR for Continental) pin and FP PWR pin at the FPDM harness connector. on your web site it shows this diagram with 85 going to ground. ![]()
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