i have a 1995 chevy 1500 p.k. and my fuel pump will not go off unless i disconnect the battery. i replaced the relay also unplug the computer and ingtionion switch to make sure they where not the problem. even with this all un hook…
fuel injection pump
An Injection Pump is the device that pumps diesel (as the fuel) into the cylinders of a diesel engine. Traditionally, the injection pump is driven indirectly from the crankshaft by gears, chains or a toothed belt (often the timing belt) that also drives the camshaft. It rotates at half crankshaft speed in a conventional four-stroke diesel engine. Its timing is such that the fuel is injected only very slightly before top dead centre of that cylinder’s compression stroke. It is also common for the pump belt on gasoline engines to be driven directly from the camshaft. In some systems injection pressures can be as high as 220 bar (3190PSI).