How much power should a fuel pump have?
A good estimator of volume to power is approximately 10 hp per gallon or 2.64 hp per liter. For example if your pump flows at 50 gph it should be able to support a 500 hp engine (50 x 10 = 500). However, to actually know the gph you must also consider the fuel pressure required for your engine.
Where does a low voltage fuel pump come from?
Low voltage to the pump can only be from a low voltage at the source or a resistance in the circuit (“dropping” voltage). The only possible places for a resistance are connections (which could be anywhere including a corroded fusebox terminal), relay contacts corroded (but you’ve already changed that) or internal to the inertial switch.
What should the voltage be at the fuel pump relay?
You should have 12 volts at the dark green/yellow wire at the fuel pump relay. The inertial fuel shutoff switch is between the relay and the fuel pump. The pink/black wire from the inertial switch to the fuel pump should have 12 volts. You can measure the voltage, on the pink/black wire, at the fuel pump.
Where is the fuel pump voltage test located?
It is located at the back of the vehicle next to or in the fuel tank. It pumps fuel from the tank to the engine. The pump voltage test is important for checking the effectiveness of the fuel pump. Here’s how to perform the test. Connect the digital multimeter to the positive and negative terminals of the fuel pump.
Where is the fuse for the fuel pump?
The fuse is called: Fuel System/Anti-theft Maxi-fuse. It’s under the hood, in the fuse/relay box. You are getting voltage, so, the fuse is ok. You should have 12 volts at the dark green/yellow wire at the fuel pump relay. The inertial fuel shutoff switch is between the relay and the fuel pump.
Low voltage to the pump can only be from a low voltage at the source or a resistance in the circuit (“dropping” voltage). The only possible places for a resistance are connections (which could be anywhere including a corroded fusebox terminal), relay contacts corroded (but you’ve already changed that) or internal to the inertial switch.
You should have 12 volts at the dark green/yellow wire at the fuel pump relay. The inertial fuel shutoff switch is between the relay and the fuel pump. The pink/black wire from the inertial switch to the fuel pump should have 12 volts. You can measure the voltage, on the pink/black wire, at the fuel pump.
It is located at the back of the vehicle next to or in the fuel tank. It pumps fuel from the tank to the engine. The pump voltage test is important for checking the effectiveness of the fuel pump. Here’s how to perform the test. Connect the digital multimeter to the positive and negative terminals of the fuel pump.
What should fuel pressure be if fuel pump is not activating?
If the fuel pump relay IS NOT activating the fuel pump, the fuel pressure test gauge will register 0 PSI when cranking the engine. If the fuel pump relay is activating the fuel pump, then it’ll register about 56-62 PSI even if the engine does not start. Any fuel pressure below 50 PSI and the engine will NOT start.