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Fuel delivery problems on 1999 Scarab 33AVS

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Fuel delivery problems on 1999 Scarab 33AVS

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Old 08-04-2009, 02:26 PM
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Default Fuel delivery problems on 1999 Scarab 33AVS

I have 2 x 502MPI's , when I fill the fuel tank full , both engines work perfect , when the tank gets half , then in steep turns then posrtside engine's RPM drops and power loss. Its like the engine gets no feul. When the tank gets ti 1/4 , then the engine sarts cutting out. And I can't start this engine any more ! , the other engine works perfect all the time.
This morning the engine wouldn't start , then I checked the fuel pressure valve (under the intake plenium) . Only compresed air came out of the valve . Then we turned on the ignition on/off a few times untill the fuel came out , and the engine starts correct. I fill up the fuel tank and again everything perfect , until the tank gets half way.........

Now are there two fuel pick ups in the fuel tank ? Could it be that one fuel pick up line is broken , cracked ????


Any one had this problem ?????

Thanks for leting me know

Douglas
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Old 08-04-2009, 03:42 PM
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follow the lines back to the tank to see if one pickup or two,,,, bu t sounds like one and a broken pickup
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Old 08-04-2009, 03:47 PM
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I'll chek tomorrow !
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Old 08-04-2009, 03:51 PM
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You should have an access panel under the back seat or somewhere near there. Sounds like a broke or cracked pick up tube.
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Old 08-05-2009, 09:46 AM
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I checked and on the flore there are two openings , one is the gastank inlet and vent tube , on the other one there is nothing ?
Could it be that the fuel is not picked up from the top ???

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Old 08-05-2009, 11:03 AM
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The fuel is picked up from the top of the tank......but it should be at the rear of the tank/boat near the engines/engine compartment. The fill/vent are usually at the top/front of the tank because thats usually the highest point when the boat is in the water and allows you to fill it to the max capacity.
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Old 08-05-2009, 11:40 AM
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THX wally , I looked arround but NO acces to the tank. .....
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Old 08-05-2009, 03:09 PM
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Thats kinda strange....does it have a removable floor? (the center section was one big panel that you could take off on the older boats)
I know other boats have a removeable panel inside the engine compartment to get at the fuel line fittings.....just follow them from the engine and see where they end up at...
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Old 08-13-2009, 06:07 AM
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Originally Posted by Griff View Post
You should have an access panel under the back seat or somewhere near there. Sounds like a broke or cracked pick up tube.
Sorry , I must have been sleeping when I read your post !!
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Old 08-13-2009, 09:10 AM
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On most all Scarabs the access is there are three access points. One under the bench seat and two under the carpet. They are round panels that you can use a screw driver to pop out. Never seen a Wellcraft Scarab that did not have these panels.
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