Post by
amc49 »
https://forums.nicoclub.com/amc49-u275146.html
Mon Mar 18, 2019 4:52 pm
If the filter was clogged completely then not odd at all for the pump to fail shortly after from being deadheaded all the time. Running at close to hydrolock kills them.
If pump seems to be changing noise then a pretty clear indicator it's going bad.
One of the biggest mistakes is running cars out of fuel and then trying to prime with say only one gallon of fuel in tank. It often tears up pump in minutes, they if a plastic impeller like most have maybe a solid minute of dry running before the impeller begins to melt and how so many get warrantied as 'bad' right out of the box. Yes, they're bad but because the user ruined them trying to prime with too little fuel. You should ALWAYS prime a pump with at least 3 gallons of fuel in tank to make sure the pickup strainer is COMPLETELY covered as partially covered they will suck air as it is easier to pull that than fuel. I used to warranty pumps treated like that all day long, typically more were ruined that way than by simply wearing them out. You can look up in the inlet port to see the melted impeller. Why all owner manuals now say to not run the car out of gas.
When priming listen to the pump, it will spin fast and as soon as it hits solid fuel it then lugs down to still spin but at a slightly slower rate.
Need a pressure check there, a pump can output what appears to be normal fuel amount with it just pumping into air but not output any when pressurized into the system. A worn impeller will move fluid all day long as long as the pipe is open ended. Close it and then the fuel simply backslips around the worn impeller edge to go nowhere. That can be very erratic to start and run but then it quits or otherwise acts funny, the problem will come and go.