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  #31  
Old 09-13-2008, 05:44 PM
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The flow rate I read was 1 pint in 20 seconds.


Speaking of pints, Doug- how's that beer coming?
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  #32  
Old 09-13-2008, 06:16 PM
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Maybe I'm crazy, but why doesn't Mastercraft just go back to the old external fuel pumps that seem to be bulletproof?
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  #33  
Old 09-13-2008, 07:06 PM
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Because the newer motors need more pressure than the older ones and that requires the pump to push the fuel. The Coast Guard has a lot to say about how fuel is pumped in a boat..
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  #34  
Old 09-13-2008, 07:28 PM
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The point of contention is that there are at least two other boat brands that use Indmar engines, yet don't seem to have problems with either inadequate fuel pressure or repeatedly failing fuel pumps.
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  #35  
Old 09-13-2008, 07:32 PM
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I would guess that the fuel mapping takes that into account, but I also don't know if/why an alternative hasn't been explored.
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  #36  
Old 09-14-2008, 12:01 AM
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Quote:
Originally Posted by JimN View Post
Because the newer motors need more pressure than the older ones and that requires the pump to push the fuel. The Coast Guard has a lot to say about how fuel is pumped in a boat..
The LT1 motors needed just as much fuel pressure and had no problems with external pumps. I can understand the Coast Guard part though.
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  #37  
Old 09-14-2008, 09:09 AM
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The concept of in-tank fuel pumps is attractive, and if they worked reliably then MasterCraft should be applauded for bringing it to boating. Unfortunately, they DON'T work reliably, at least if one assumes that postings here in this MC-specific website are reflective of the general run of MasterCraft owners.

Looks like a case of an excellent engineering concept with poor implementation. Unfortunately, there is no definitive information on WHY they fail, and it's especially unfortunate that MasterCraft has not been forthcoming on defining the problem for its customers, nor have they offered any assurance that they are even AWARE of the problem, let alone working hard to find a way to fix it.
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  #38  
Old 09-14-2008, 11:29 AM
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PeterN said he measured 55PSI on his pump and the LT-1 external pump put out 30, 40 at the most. 15-25 psi makes a lot of difference. With higher power, the pulse width can be controlled more accurately, not that they're doing tremendously fine adjustments, but once the 02 sensor came in, it could tweak the fuel delivery more than without the 02 sensor.
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  #39  
Old 09-14-2008, 12:41 PM
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I know both Weldon and Aeromotive make external pumps that can supply fuel for 1000 HP cars running in excess of 70 PSI of fuel pressure, and if anything they are more reliable than running 2 or 3 internal pumps like other people do. I don't see how the application would be different on a boat.
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  #40  
Old 09-14-2008, 01:04 PM
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Quote:
Originally Posted by Chicago190 View Post
I know both Weldon and Aeromotive make external pumps that can supply fuel for 1000 HP cars running in excess of 70 PSI of fuel pressure, and if anything they are more reliable than running 2 or 3 internal pumps like other people do. I don't see how the application would be different on a boat.
You don't see it, but obviously the USCG does.

Not trying to excuse MasterCraft. Their unreliable fuel systems should have been addressed years ago. I'm sure it's hard getting a fuel system approved, but just because it's hard doesn't excuse the fact that MasterCraft in-tank fuel pumps fail with a regularity that appears to be well outside the norm.
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