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05-05-2008, 09:22 AM
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#1
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Cigarette #1, I know why!
 Charter Member
Join Date: Oct 2000
Posts: 3,064
'00 Scarab Sport CC
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Merc fuel pump that is mounted on sea water pump - PLEASE READ
Last year (July) I replaced my sea water pump. Thus I installed the fuel pump on it as normal. Of course new oil was used.
Yesterday I removed both pumps to replace impellers/pump housing. I took off the fuel pump to change oil.
The oil had fuel in it and the oil looked HORRIBLE. The oil was gray looking!! That oil had only 20 - 25 hours on it.
Anyway, everyone should check / replace the oil for the fuel pump in the seawater pump. Looks like it needs changing more than even motor oil.
Now - is there a pump that can be mounted in the stock location that does NOT leak fuel into the seawater pump oil reservoir?
__________________
BillR
'00 Scarab Sport 302
'02 Cigarette Top Gun
'02 PQ 340
'00 PQ 280
'98 Scarab 20
'97 Baja Outlaw 20
'72 Checkmate
'65 Glastron
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05-05-2008, 01:34 PM
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#2
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Registered
Join Date: Jul 2007
Location: San Diego
Posts: 933
Advantage 28ft Sport Cat w/ pair of 8's
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I have the oil changed in mine every year. it should not have fuel in it. If it does, the diaphram is bad, and leaking. Time for a rebuild kit.
Darrell.
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05-05-2008, 02:35 PM
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#3
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SORE MEMBER
 Platinum Member
Join Date: Apr 2004
Location: Banana Bend, Texas
Posts: 4,166
Kawa 1100 ZXI, SeaDoo RXP Stryker Equalizer 2800
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Quote:
Originally Posted by DMOORE
I have the oil changed in mine every year. it should not have fuel in it. If it does, the diaphragm is bad, and leaking. Time for a rebuild kit.
Darrell.
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Agreed, diaphragm is shot.
__________________
Mark,
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05-05-2008, 04:13 PM
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#4
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Registered
Join Date: Nov 2005
Location: Fredericksburg, Va
Posts: 2,176
checkmate 251 convincor,checkmate 253 convincor, 50 gibson
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Yes, sounds like pump leaking...but I still go by original thoughts from what I have seen, what POS set-up !! and costly to repair !! Rob
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05-05-2008, 05:43 PM
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#5
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Registered
Join Date: Jan 2002
Location: Further South East of Dome Island
Posts: 1,314
1996, Donzi, 22 Classic 502
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A nice electric pump replacement sounds good. Anyone ever done it?
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05-05-2008, 08:13 PM
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#6
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Ginger or Mary Ann?
Charter Member
Join Date: Oct 2000
Location: Lafayette, IN
Posts: 9,159
1999 32 Fountain Fever, 1995 Baja 29' Cruiser
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Previous boat did always had a hint of gas smell to teh oil and the oil was thinned. Thinking the pump diaphram was leaking, I replaced it. Didn't change a thing. Just got into the habit of changing the SW pump oil every yr and never had any issues. Just considered that the diaphram does allow enough fuel to seek thru it to cause this condition.
Seems like a common complaint. If the diaphram really was bad, I'd think the oil level would rise till it shows in the puke tube.
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05-05-2008, 10:06 PM
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#7
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Registered
Join Date: Jun 2006
Location: Lake Conroe, TX.
Posts: 14,631
39' Sea Ray, 38' Nortech, 18' Taylor SJ
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I have had this problem with a customers boat also.
I put new fuel pumps and they still get fuel into the oil.
He just works around the problem by changing the oil when he does the engine.
I would like to know if this really is normal or not.
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