have no bat ongray wire to fuel pump. DO have bat pin 30 fuel pump relay.
#1
have no bat ongray wire to fuel pump. DO have bat pin 30 fuel pump relay.
can't figure out a way to eliminate bad ign sw. Have jumpered 30 to 87 and still pump will not run. where does pump get grnd
#3
yes found that wire it was clean but spruced it up have no batt on relay coil wire so that when pcm gives ground it activates pump relay. I don't have wiring schematics so what gives terminal xx battery ? pcm or ign sw?
#4
CF Active Member
The ECM (Engine Control Module) provides the 12V to activate the fuel pump relay.
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#8
CF Senior Member
Fuel system control module,so I took a look,07 Tahoe that I got under,is 3 line pipe system,no fscm,so what do you have,new 1 pipe system,no return?or 2 pipe,with return and pressure regulator on intake