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A bad fuel pump will cause the fuel not to flow into the fuel pump. Another cause can be a leak in the fuel line.
The fuel pump pressure is what allows the fuel to flow to the engine. It determines how much goes in and also when.
Clogged fuel filter, or weak fuel pump.
Disconnect the fuel line that goes from the pump to the fuel filter and check for flow - if you get fuel there, the pump is ok. If not, the pump needs to be replaced. If ok, re-connect the fuel line and disconnect the line that comes out of the filter (filter to engine) and checlk for flow. If little or no flow, replace the filter. If filter is ok, reconnect the fuel line and look for an obstruction further up the line. You could also trouble-shoot in reverse by disconnecting the fuel line where it connects at the engine and checking for flow there. Then just work backwards from there.
If the fuel pump is electric, removing the positive battery cable will stop the flow of fuel.
yes
Sure, a completely clogged filter can stop the flow of fuel.
A plugged fuel filter can reduce or completely block the flow of fuel.
Inspect the ground wire for the pump assembly. It may be loose, broken or rusty.
Some do and some don't. Some use gravity flow and some use a diaphragm type fuel pump.
Yes and some are in tank for the same reason they are immersed in it
If the fuel pump relay goes bad your fuel pump will not get power and you will get no fuel. If your fuel pressure is showing too low your pump is either weak and needs to be replaced, your fuel lines are restricted somewhere ( or possibly leaking ) or your fuel filter needs to be replaced.