How much voltage does it take to run a fuel pump?
System voltage should read 11.8 – 12.6v DC or higher with no electrical loads on the system. If voltage reads less, starting and charging system should be investigated before performing fuel system electrical testing. 1. Connect digital voltmeter to fuel pump wiring at fuel pump connector.
Is there no power to the fuel pump?
No power to the fuel pump and the fuel relay is not getti… Q: No power to the fuel pump and the fuel relay is not getting power. My car has 190000 miles.
Why is the fuel pump and relay not working?
The ignition circuit, which includes the ignition switch, controls power to many components, including the fuel pump and relay. If there is an issue with the switch or the circuit, perhaps a wiring problem, then power to the fuel system may be cut off.
How can I tell if my fuel pump is faulty?
Inspect the fuel pump visually. If fuel is dripping, the diaphragm is faulty and you need a new pump. Detach the fuel line from the carburetor and put it in an empty container. Crank the engine and watch how the fuel flows from the line. If you see steady, strong spurts, then the pump works.
Can a mechanical fuel pump cause hard starting?
Most modern vehicles use electric fuel pumps, but anyone who works on older models and classic cars must be familiar with mechanical fuel pumps. Amateurs may be tempted to blame the fuel pump for problems with drivability and hard starting, but the pros know that the gasoline itself may be at fault.
How many volts does a fuel pump have?
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. Here’s the wiring diagram. Click on fig. 32. http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528018efd2
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.
Why does my car only have 12 volts at the pump?
Turns out it was the computer. You’re only going to see 12+ volts at the pump just like at the inertia switch for two seconds after the ignition’s turn to run and then it’ll drop back down and it won’t go back up again to 12+ until the motors turning 400+ RPMs . The two second 12Volt hit is just to prime the 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.