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joerg_1

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Posts: 6
Reply with quote  #1 
Hi,
since one week I'm looking for a solution.
The engine is only used in holidays 4-6 weeks a year.
Last year everything was ok. Boat and engine stayed in storage.
I took the gearcase with me, to let renew all seals, impeller... by a professional. And new sparks.
Easy start like every year. But on higher rpm the engine suddenly runs bad after some minutes. On full throttle only one minute or less.
Fuel pump is working, the filter after the pump is always filled half.
No faults in the EvDiag.
I noticed at full throttle, that it's only one cylinder not running. I tested it only for around 30 seconds. When I stop #1 there's no effect, only when stopping #2 or #3.
#1 is the last injector left original. Is it possible that this is the reason, without registered fault?
Only 469 hours, crazy...

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Gotsea

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Posts: 1,385
Reply with quote  #2 
A dirty clog injector will not register any fault, since you say that here is no change when you drop that injector, the reason could be that one is not shooting any or very little fuel into the camber, just a thought   
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1994 24 WA Baha
2008 300 HP DPXSC S/N 05228253
15 1/4 X 19 Mirage Plus 47 MPH top end @ 5,750 RPM
32 MPH cruising @ 12.5 g/h
 South Florida
joerg_1

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Posts: 6
Reply with quote  #3 
I have a used working injector in reserve, with this one in #1, the same fault.
I exchanged the ignition coils of #2 and #1, nothing.
Is it possible, that the Fuel Pump Vapor Separator doesn't work correctly?
Crosbyman

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Posts: 537
Reply with quote  #4 
check list  any use ... things to investigate

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ETEC 75 HP  2005  ser# 05107924  &  1966  9.5 hp  Sportwin 9622a 

joerg_1

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Posts: 6
Reply with quote  #5 
The root cause: Little rubber particles in the vapor pump!
rickmcd53

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Posts: 2,492
Reply with quote  #6 
Check the fuel inlet hose to the vapor seperator. The one at the bottom of the VST closest to the engine. If it is very soft at the right angle bend then it is degrading and causing rubber particles.
joerg_1

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Posts: 6
Reply with quote  #7 
There was a soft hose after the fuel filter. I replaced it.
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