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Power Strokes
7.3 Tech
Bad fuel pump, regulator or relay????
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[QUOTE="gnxtc2, post: 1075158, member: 1414"] UPDATE: Stopped by my friend's diesel shop. I popped the hood and the fuel pressure is now 75lbs according to the gauge on the FPR. Told him what was going on. He put an inline gauge (Snap-On) after the pump. It was reading 85lbs. I then go in the truck and start power braking. The fuel pressure by the pump goes to 0. The truck was still running on 0 pressure. To confirm his gauge, I saw 0 pressure by the FPR. We started checking for power at the pump. He disconnects the connector by the pump and checks for voltage.....nothing. Yes, the truck is still running, don't ask me how. We go under the hood and check the relay. There was no power on the load side of the relay. Then check for voltage on control/coil side of the relay...nothing. I have a Standard Ignition NO/NC oil pressure switch installed by the oil filter head. The NC side is connected to the little wire on the starter relay. The NO is connected to the former fuel heater wire. The common goes to the coil of the relay. He wiggles the terminals on oil pressure switch and you can see the fuel pressure jumping. Bad oil pressure switch. I jump out the oil pressure switch. The fuel heater wire (IGN power) is now connected directly to the coil of the relay. Motor sounds smoother. Checked the fuel pressure gauges, by the pump it was 85 and up by the FPR was 80; more like it. I backed the FP down to 65. What has me stumped, the motor was running without the pump. If I didn't see it with my own eyes, I would never have believed it. There was 0 pressure and the pump disconnected. Was it running on vacuum? Probably get rid of the oil pressure switch and go with an enertia switch from a Crown Vic. Billy T. [email]gnxtc2@aol.com[/email] [/QUOTE]
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Bad fuel pump, regulator or relay????
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