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  • Replacing fuel filter & water separator...

    ...do I need to worry about remaining fuel in the tank before unscrewing the water separator?

    Will gravity empty it into the bilge once I break this deal or is there a fuel pump in the tank that will prevent flow out?

    Sorry, a newbie owner here just trying to replace some preventative parts. Thanks for any and all help!

    1987 PS 190.

  • #2
    A little fuel will spill from bowl, but the tank will not flow out.

    I am assuming you have something like the Racor 110 fuel/water separator setup.

    Change the fuel filter and the fuel/water separator while you are getting messy in the bilge...

    Easy job, 1/2h to an hour from prep to cleanup.
    1991 ProStar / 351W with 1:1 Velvet Drive

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    • #3
      Thank you! May I ask what keeps the fuel from flowing out? Is the fuel pump in the tank itself?

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      • #4
        the fuel could flow out by gravity . you just have to make sure the fuel tank outlet hose is higher than the tank itself ,the fuel can't flow uphill, no fuel pump in the tank it is on the motor ,
        the fuel pump also has a small filter in the bottom of it that you should change to .

        there will be some spillage of fuel no biggie just be careful


        ...
        sigpic

        1988 mastercraft tristar (open bow).

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        • #5
          Thanks pbgbottle! It sounds like as soon as I unscrew the fuel separator that I have a chance of draining the fuel tank. The fuel separator is bolted at floor level so maybe I should unbolt it and lift it as high as possible before changing. Hmm. I'll be prepared for spillage.

          I also have a fuel filter ready to go, thanks for mentioning that.

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          • #6
            I did a quick look weekend before last for the fuel water separator and did not see one in the engine compartment on my X9. Is that sucker somewhere other than on the engine like my other boats, like on the gas tank under the back ski locker?

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            • #7
              My 1994 Prostar 205 had a shutoff value at the tank in the back to stop any type of gravity feed when I had a water/fuel separator. The dealer removed it to help out with a fuel injection issue.

              2005 MariStar 210VRS - MCX - ACME #845
              1994 Prostar 205 TBI 350 (SOLD)

              War Eagle

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              • #8
                I've got an '85 and I'm assuming you have the 351W engine in yours. My water fuel separator is mounted low in the bilge area. The only spill I've experienced has been when taking the filter off. Whatever was in the filter would spill a little. I've never had the tank empty or fuel coming pouring out of the line when changing the fuel/water separator, so I wouldn't think you would have an issue either. If you are really concerned you could remove the fuel line to the fuel/water separator and plug it unitl you are done. I would think this would cause more spillage, but not gas tank empty spillage.
                "The doctor said I swallow a lot of aggression... along with a lot of pizzas!"

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                • #9
                  Hey guys, I ended up putting some rubber hose around the jaws of my vice grips and clamping the fuel line closed while I replaced the filters. I just didn't want fuel rushing out and it seemed like cheap insurance.

                  Everything went smoothly! 2 new filters ready for summer 2012.

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                  • #10
                    Originally posted by catamount View Post
                    Hey guys, I ended up putting some rubber hose around the jaws of my vice grips and clamping the fuel line closed while I replaced the filters. I just didn't want fuel rushing out and it seemed like cheap insurance.

                    Everything went smoothly! 2 new filters ready for summer 2012.
                    How many feet of fuel line does it take to replace the fuel line on a 92 Prostar? And is that a fairly easy job to replace it?
                    http://weathersticker.wunderground.c.../Brunswick.gif

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                    • #11
                      Dog, no more than 19 ft. Really I think it is approximately 10-12 ft needed.

                      Regarding draining tank, there is an anti siphon valve on the top of the tank that keeps fuel from just draining out without suction from pump. Sometimes this is cause of fuel flow problems. This applies to carbed motors only.
                      Last edited by mayo93prostar; 04-18-2012, 10:41 PM.
                      1993 Blue Stars and Stripes Prostar Powerslot 351HO
                      Mastercraft: Face It - If you are not a good skier behind this boat, you are not a good skier.

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                      • #12
                        Originally posted by mayo93prostar View Post
                        Do, no more than 19 ft.

                        Regarding draining tank, there is an anti siphon valve on the top of the tank that keeps fuel from just draining out without suction from pump. Sometimes this is cause of fuel flow problems. This applies to carbed motors only.
                        Interesting! That's really helpful, thanks!

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                        • #13
                          Re fuel line replcement:

                          1991 ProStar / 351W with 1:1 Velvet Drive

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                          • #14
                            Glad you got it worked out, lots of good guys on here that know their stuff!
                            Last edited by atlfootr; 04-19-2012, 11:15 PM.
                            NEW SKINS ...
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