1996 Mercury SportJet 120XR Won't hot start -- Hi Performance Boats Inc.

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Date Posted: 05:42:14 04/23/07 Mon
Author: Chris
Subject: 1996 Mercury SportJet 120XR Won't hot start

Another season a new problem.

1996 SeaRay Sea Rayder F14 with a Mercury SportJet 120XR. It's a 2 stroke, 4 cylinder, 2 carb, oil injected engine. The engine was originally a Crysler Force outboard, bought by Mercury and sold as a SportJet in various types of jet boats.

Anyways. It was running OK last year. The only problem was cold starting. I needed a shot of starter fluid in each carb then it start right up and restart without a problem.

Based on recommendations from a couple of mechanics I performed the following maintenance over the winter. I installed water fuel seperator filter and a primer bulb. In that order from the fuel tank.

So here is the problem. First time in the water after this maintenance, pumped the primer bulb and it started right up ! Ran great. I ran it up river for a while, then shut it down. Then it wouldn't start. It would kick once or twice but not start.

The primer bulb was firm, starting fluid didn't work. I removed the plugs, they were not wet. I left the plugs out, cranked the engine, let it sit, put new plugs in. No luck. I did notice if I squeezed the primer bulb firmly gas would flow out of the carb overflow.

I finally got a started by disconnecting fuel line between the fuel filter. Let the gas run out. Reconnected it and the engine started.

I managed to get back to the boat ramp. Shut is down and once again it wouldn't start.

My guesses, are maybe something wrong in the float or inlet needle? Maybe the primer bulb is causing too much fuel pressure to remain in the line?

Any and all thoughts are welcome. Thanks in advance !

--Chris

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Replies:

[> Re: 1996 Mercury SportJet 120XR Won't hot start -- peter, 11:10:45 12/12/08 Fri

I had the same problem. Manynboat do with the new gasahol additive in our fuel. Replaced both floats and carb float needles. Runs better than ever. Capt Pete.

>Another season a new problem.
>
>1996 SeaRay Sea Rayder F14 with a Mercury SportJet
>120XR. It's a 2 stroke, 4 cylinder, 2 carb, oil
>injected engine. The engine was originally a Crysler
>Force outboard, bought by Mercury and sold as a
>SportJet in various types of jet boats.
>
>Anyways. It was running OK last year. The only problem
>was cold starting. I needed a shot of starter fluid in
>each carb then it start right up and restart without a
>problem.
>
>Based on recommendations from a couple of mechanics I
>performed the following maintenance over the winter. I
>installed water fuel seperator filter and a primer
>bulb. In that order from the fuel tank.
>
>So here is the problem. First time in the water after
>this maintenance, pumped the primer bulb and it
>started right up ! Ran great. I ran it up river for a
>while, then shut it down. Then it wouldn't start. It
>would kick once or twice but not start.
>
>The primer bulb was firm, starting fluid didn't work.
>I removed the plugs, they were not wet. I left the
>plugs out, cranked the engine, let it sit, put new
>plugs in. No luck. I did notice if I squeezed the
>primer bulb firmly gas would flow out of the carb
>overflow.
>
>I finally got a started by disconnecting fuel line
>between the fuel filter. Let the gas run out.
>Reconnected it and the engine started.
>
>I managed to get back to the boat ramp. Shut is down
>and once again it wouldn't start.
>
>My guesses, are maybe something wrong in the float or
>inlet needle? Maybe the primer bulb is causing too
>much fuel pressure to remain in the line?
>
>Any and all thoughts are welcome. Thanks in advance !
>
>--Chris

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