Fuel pump hums like it is pumping engine getting spark but will not start. Would a fuel pump make a humming sound if diaphragm is bad What else could be wrong?

Stuck fuel injector or busted diaphragm inside the fuel pressure regulator.

an engine is hottest after you turn it off. The humming is the cooling fan automaticly running to cool your engine down for longer engine life.

If this whining or humming is out of the ordinary, it's probably a bearing or bushing on the belt assembly that's wearing out.

If the engine is warmed up, the thermostat has opened and coolant is circulating, the pump is pumping.

A beer engine is a device for pumping beer from a cask in a pub's cellar.

As long as the engine is running, this is normal.

It will eventually plug up. You will then either starve the engine of oil, or be pumping unfiltered oil through the engine. Both will lead to engine failure. It will eventually plug up. You will then either starve the engine of oil, or be pumping unfiltered oil through the engine. Both will lead to engine failure.

It would depend on the vehicle. If the vehicle has a carburetor, the pumping action primes the engine with fuel to help start the engine. If the vehicle has fuel injection, pumping is not required.

There could be a humming noise from the engine of a 2002 Toyota Corolla because of low oil or a fouled spark plug. It can also indicate a more serious problem.

radiator fans running to cool engine...

The humming is a series of explosions in the engine happenning very quickly. Could also be an electric fuel pump if the vehicle is equipped with one.

where is the humming noise coming from? if it's coming thru the speakers and matches the rev tone of the engine, then you have a bad ground in your stereo.

There can be a slight humming noise while driving a neon. This sound could come purely from the engine to indicate that it is running.

Pumping water from deep mines.

Your engine might make a humming noise near the alternator after you shut it down because the fan is still running or because the fuel pump is shutting down. Another cause for the humming noise could be the AC motor turning off.

There's a diaphragm with a cable in the engine compartment going to the throttle linkage, on the diaphragm there's a connector with wires, disconnect the connector and spray some contact cleaner into the connector and diaphragm. See if that corrects your problem.

Your check valve is not holding in the oil pump and allowing the oil to fill the engine. When you start up, the oil pump is trying to empty the engine and excess is pumping out the breather or overflow.

The fuel pump is not building pressure to push the fuel to the engine so i would suggest getting your fuel pump checked and or get a new fuel pump.

there is no check valve only a diaphragm pump on the side of the engine. if this is what you are talking about it is a diaphragm sandwiched between two aluminum blocks and then a gasket between that and the engine.

NO. You must check the fuel pressure with a fuel gauge. Just because you hear the fuel pump running doe's not mean it is pumping enough pressure to stat the engine. That engine requires 60 to 66 LBS of fuel pressure to be able to start and to run. NO higher and NO lower.

The first steam engine, a water pump type, was used in mines, pumping stations, and the textile industry.

No fuel (out, or pump not pumping) or no spark (or really bad timing).

No, he improved on Newcomen's design for pumping engines.

First industrial use was for pumping water out of underground mines.

Bad bearings or bad piston rings