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8

While disconnecting the fuel pump relay and running the engine will work, there are other alternatives. If you can access the Schr├Ąder valve, depress it to release the pressurized fuel before disconnecting the fuel lines. This will have the effect of reducing fuel line pressure. It helps to have the vehicle cool down and not running for a few hours. I ...


6

You are correct in how to do this. I was just watching an episode of "Tech Garage" and they were talking about this very topic. Their suggested methodology was to pull the fuel pump fuse, and run the engine till it stopped on it's own. You can now change out the fuel filter. You will still get some fuel out of the line, but nothing like having 30-60 psi of ...


1

I decided to buy a new fuel filter, and measure after the old filter, and before and after the new filter. I let it idle two minutes before taking each reading. After the old filter, which had been in there for ages, it read 35 psi. Before and after the new filter were both also 35 psi, although the needle on the prefilter reading was jittering a little ...


3

This will all depend on the type of fuel pump that your vehicle uses. The stronger the pump, the larger the pressure difference it can manage. If you wanted to calculate a theoretical limit, I guess you could estimate it by calculating the fluid power based on the flow rate your engine requires and the pressure upstream of the fuel filter: Power = Pressure ...



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