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Old 28 March 2011, 05:28   #1
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Mariner 75 ELPTO fuel pump

Hi all

I've a problem with my Mariner 75 outboard. It can be hard to start, but seems to run OK for 15 minutes or so before conking out. It's then a complete sod to restart. Gave it to an engineer who rebuilt all the carbs at great expense, but the problem wasn't solved.

It seems to me that it must be a fuel supply problem. I understand fuel pump rebuild kits are fairly inexpensive, but I'm having trouble tracking down the correct kit in the UK. Anyone know?

Also, other suggestions welcomed!
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Old 28 March 2011, 06:06   #2
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Why not try running it whilst squeezing the bulb?

you will need to do it at a reasonable power setting, say just on the plane. If it runs OK, then maybe it could be the fuel pump??

Does it start OK immediately if you prime it again?
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Old 28 March 2011, 06:12   #3
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75 Mariner

Air Vent on top of fuel tank. Make sure this is undone. Engine will run for a few mins then conk out. Dosent sound like fuel pump if engine runs for awhile??? Could be wrong? Normally engine wont run and have to keep pumping bulb
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Old 28 March 2011, 09:52   #4
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Thanks for the replies chaps. No, priming made no difference and was actually really difficult to squeeze the bulb. So the vent is something to check out. I had a ribbon before and never worried about venting. Is it something I should keep closed during winter etc?
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Old 28 March 2011, 10:33   #5
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75 mariner

When I winterise my customers OB, after running the OB through the fuel stabilizer mix I always shut the vent closed. Some guys do and some guys dont, really up to the tech and customer I suppose. CHEERS
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Old 28 March 2011, 18:22   #6
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[key parts will have square fuel pump diaphram kits at modest cost.

if its the same as my merc 60hp I think its under 20 for a kit

Good luck
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Old 29 March 2011, 07:28   #7
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We sell the genuine one for 15.26. With Ribnet discount its 13.74 with free delivery!
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Old 06 April 2011, 04:30   #8
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Hi Yep I had this on my 75hp Mariner ELPTO engine. It was the fuel pump. The kit was easy to fit but make sure you get the right one as there is a similar kit that doesnt have the holes in the diaphram for the auto oil mix. You will see once you get the pump appart.

If the fuel line bulb is sucked flat the the tank vent is shut or not open enough. Keep it open.
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Old 06 April 2011, 06:30   #9
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Just changed all gaskets etc on my merc 90 really easy job it will take you 30 mins tops from start to finish. Make sure you line all the gaskets up correctly there are cut outs on them that need to line up really obvious
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Old 08 May 2011, 17:02   #10
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Did the work yesterday, and today finally had proper day's RIBbing on her!

Thanks for you help chaps.
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