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Old 27 April 2003, 12:47   #1
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Mariner fuel problem

Hi folks,

I have been having some probs the fuel supply to my Mariner 60 ELPTO engine the cause of which has, so far, eluded me.

At high speed running above 1500rpm there are no problems at all. However, after a period of say 30-45 mins low speed running below 1500rpm (i.e from harbour entrance to marina at 4 knots - speed limit of 8 knots in force but the boat does not like that speed) the engine will suddenly die. The cure is to pump the primer bulb (which is quite soft) to get fuel back to the engine. All is then OK. I have an under-deck tank with fuel filter in the consol.

I get the impression that the engine fuel pump is not happy at low revs but, before I go down that route, I thought I would ask if anyone else has had similar problems and if so, what was the cure. Are there non-return valves in the primer bulb which could have failed?

Thanks in advance for any help.
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Old 27 April 2003, 12:51   #2
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Stating the obvious but I presume that the in line fuel filter has been changed recently?
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Old 27 April 2003, 13:13   #3
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Yes, last summer. The prob. occured both before and after the change.
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Old 27 April 2003, 19:40   #4
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The primer bulb does have valves but they're unlikely to be the problem. The fuel pump also has them - more likely. You could be sucking a tiny bit of air which a fast running pump could cope with - not so likely. Pump diaphragm perforated or stiffened up with age - more likely.

Hope this is of help.

JW.
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Old 28 April 2003, 00:39   #5
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It does sound like it is sucking air in at low throttle but usually that would manifest at all throttle levels. I agree with jwalker about the pump diaphragm. I had a yam that did a similar thing but that also used to lose a bit of throttle response from time to time, found to be a dodgy tank vent so that is also worth checking out but probably unlikely.
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Old 29 April 2003, 07:35   #6
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Fuel

Hi There

Check the fuel lines for any small holes. We had the same problem years ago and it was a pin prick hole that was sucking in air and at full revs everything was fine but below 1500 the engine would die.

Julian
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Old 29 April 2003, 08:10   #7
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This may be a bit unlikely, but what oil mix are you using?

At low speeds the plugs may be getting coated to the extent they give up. Do you get lots of smoke??

I used to use a Mariner 60 in the early 90's and the local engineer advised double oil as same block had seized on a few others of the type.
Great at speed, trolling OK but 5-10 mins at tickover and it died.

Needed a good run to clean it out, which it got !!!

Tiger
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Old 29 April 2003, 10:27   #8
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Peter

Several things you can try if you think itís a fuel supply problem.

The first is the filler cap has the integral breather incorporated, open the cap and you can unscrew the screen to check itís free from debris.

Worth also leaving the cap open slightly to see if that cures the problem, only ever had one faulty unit but itís worth a go, was having a similar problem to you so worth a go.

Failing that if you think its sucking air, which is pretty unlikely, fit a temporary clear piece of hose between the engine connector and the fuel line. If it is sucking air bubbles will appear in the pipe.

J
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Old 29 April 2003, 10:57   #9
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My 10p is on air getting into the fuel line.
Take a spare tank and use IT'S line to connect to your engine.
That's not an absolute answer but it is a good clue!
Had exactly this problem on my Avon 6.2 with a 130 Honda.
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Old 29 April 2003, 11:02   #10
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