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Fuel Pumps
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FUEL PUMPS They were powered by the cam, took two bolts and a couple of gas line connections, easier than changing a tire ---- what the hell happened? Why do we call it progress? TODAY WE HAVE Fuel System Diagnostics and Fuel Pump Installation First off, we don't even know if it is the fuel pump. We have crankshaft sensors, fuel pump relays, air flow sensors, injector relays and oh yeah, maybe a plugged fuel filter. We may need to drain and drop the fuel tank to get to the fuel pump and we sure don't want to do that to a good fuel pump. A wiring diagram is the first step. Check voltage to the pump's power circuit and resistance to the pump's ground. The pump could be wired through an inertia safety switch or an oil pressure switch; check your wiring diagram.
Keep in mind that the pump can't run without electricity and anything that keeps current from reaching the pump such as faulty, broken or corroded wiring could cause failure. Also rust dirt and sediment of any kind could be the culprit and you want to be sure that this problem is corrected before you install the new pump. Modern fuel pumps are designed for long term use, and they depend on lubrication and cooling provided by the fuel. Keeping a full tank will decrease condensation and rust. Oh yeah, if the customer is stranded two hours after picking up his vehicle you will have to replace the pump again. The parts place will replace the pump, you may be out your labor and if the second one fails change parts stores and brands, maybe a Carter instead of a Motorcraft or vice versa----it's been known to happen.
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