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Juan Grande

Merc 4 Stroke Leaking Gas

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I'm hoping the wealth of knowledge in this forum can help me out. My father-in-law has a 2003 60hp Mercury 4 stroke EFI. When he starts the motor, gas leaks out of the silver valve in the middle of the top pic below. Must be part of the fuel pump.He just had a bunch of work done on the fuel system two years ago, so he wants to make sure it's not something simple before bringing it in. Any insight would be much appreciated.



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I believe there is supposed to be a hose on there, if I recall correctly, from the fuel rail to this barb connection.

I'd do some searching under the hood to see if they missed a connection.


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Isn't that where the overflow hose connects? Fuel injection is high pressure, much more than can be burned, so there is a recirculation system in the loop.

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That looks to be the fuel pressure regulator and yes there should be a hose connected to it. I would guess that the hose is laying in there somewhere tucked under or behind something. Guessing its the return line since the engine will actually run without the hose thats supposed to be hooked to it is not on. There are free downloadable repair manuals on line so you can look and see how and where everything is supposed to go. Good luck!

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I bet that has been missing since he had the work done, just didn't notice it before now. Or perhaps it wasn't fully put back on and worked its way off, but there should definitely be a hose on there.

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