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Old 07-09-2018, 12:58 PM
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l8kebum l8kebum is offline
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Boat: 2004 X-Star
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8.1 Engine/transmission issues

04 Xstar with 8.1L motor.

I was cruising around 30 mph when speed all of a sudden dropped to 8 mph. I pulled the throttle back and accelerated again like nothing was wrong. Cruised for a few minutes (roughly 3-5) and the same thing happened. Killed the engine. Started back up with no issue. Put in gear and would not go past a trolling speed. At this time, the flame arrestor seemed to be gasping for air and the transmission began to have a slight knock. I killed the motor and towed in.

Looking to being troubleshooting tonight or tomorrow. Has anyone had a similar experience? Transmission fluids are low. I will be adding and checking for leaks as a step 1. Also, to note, perfect pass was not engaged to cause the slow down.

Many thanks in advance.
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Old 07-09-2018, 01:49 PM
BudmanV24 BudmanV24 is offline
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Fuel pump?
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2006 MasterCraft X1 - Sold
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Old 07-09-2018, 02:43 PM
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l8kebum l8kebum is offline
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Check that on the water, didnít seem to be the issue. I will test again.


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Old 07-09-2018, 03:46 PM
lj_mastercraft lj_mastercraft is offline
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Fuel pump is my guess. Had the exact same scenario on my boat.
Only thing curious is that it worked once you went back to neutral with the throttle.

Plug up to the fuel rail and see what the pressure is, or plug in an OBD and see fuel psi.

Mine was ~20 PSI, and I had knock and all the same symptoms as you.

Mine is a 2005. Be prepared to pay $750 for a new fuel pump.
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Old 07-09-2018, 03:47 PM
lj_mastercraft lj_mastercraft is offline
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FYI - Low fuel pressure causes all SORTS of issues.

I was seeing cam position sensor problems, etc.

New fuel pump, and everything else worked out just fine. The new fuel pump doesn't look like the old one, but is a direct replacement. It appears to be more robust, dual, different filters, etc.
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Old 07-09-2018, 10:59 PM
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l8kebum l8kebum is offline
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Thanks all. Going to get testing the fuel pump and check filter. Iíll report back my final fine. Please keep suggestions coming if you have them.


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  #7  
Old 07-09-2018, 11:00 PM
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l8kebum l8kebum is offline
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Quote:
Originally Posted by lj_mastercraft View Post
FYI - Low fuel pressure causes all SORTS of issues.



I was seeing cam position sensor problems, etc.



New fuel pump, and everything else worked out just fine. The new fuel pump doesn't look like the old one, but is a direct replacement. It appears to be more robust, dual, different filters, etc.


Do you happen to have a part number?


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Old 07-14-2018, 01:28 AM
lj_mastercraft lj_mastercraft is offline
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Sorry for the delay; just now checking this thread.

Part# 155205 - MODULE-FUEL PUMP 214/30/35/45/55
Part# 155102 - GASKET-FUEL MODULE

I paid $826.94 for the above two, including tax. I'm sure I could have got them for a lower price, but I opted to go through the dealership as I was desperate to get the boat out on the water.
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  #9  
Old 07-14-2018, 01:30 AM
lj_mastercraft lj_mastercraft is offline
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Here's the fuel pump:
https://mcpartsdepot.com/collections...illenium-10-14

Here's the gasket:
https://mcpartsdepot.com/products/ga...n-o-d-12-holes

Looks like going through MCParts, you're looking at $759.30 for both, plus tax and shipping.

It is concerning, however, that MCParts shows it's for the 8.1L from 2005 onward in all boats. You have a 2004, so wondering what's changed.

To avoid getting the wrong part, I would suggest calling a dealer, having them look the part number up, then confirming. It very well may be the same part, but would not recommend taking the risk.
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  #10  
Old 08-18-2018, 07:26 AM
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l8kebum l8kebum is offline
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Long overdue outcome.

Issue was resolved with a fuel pump. Replaced the pump inside the plastic housing. Used Airtex E2044. Purchase from amazon for $40. Same pump at OReillyís was $85. Install was fairly simple.

Thanks all for the suggestions. This is the first fuel pump issue Iíve had in a vehicle or boat.


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