MARINER 15Hp Fuel Issue

[Dean1]

Hi guys i have a 2003 model 15hp 2 stroke been naughty. It started off where if you held it at wide open throttle it would start dieing, but squeezing the primer bulb got it going again. But has got worse and worse and wont run at all now. Its not the air bleed on fuel tank. Its 5 hrs away from me so at easter i will be able to start trying to find the issue. Is there any common fuel issues with these? Thanks in advance

[scottar]

Could be crap in the carbie that only initially made it's way somewhere critical under high flow conditions or a faulty fuel pump.

[scottar]

Also check the internal condition of the fuel hose.

[ericcs]

Sounds like your fuel pump. pull it apart and check the diaphragm and gaskets. you will probably be able to get a kit to rebuild it. if it still won't run at wide open throttle, it may have a blocked main jet.

[ranmar850]

Hey, I have one of these on the stand at the moment with a fuel(?) problem. it was running fine last year, thought I'd sell it. Put it in the tank, not a splutter. Plenty of spark, put new plugs in anyway. Now, when you look at these from the front, operating the twist choke knob deoresses a blue button on the lright. Primer, I'm guessing. If you depress that blue button manually, pump it, should fuel spray out of the notch on the side of that housing? May be the same problem as yours.

[catshark]

give the carbie a bath . might unblock some gum residue inside.

[Noelm]

Pumping the primer kind of takes the fuel pump out of the system, probably check it first for leaks or broken diaphragm, then move along the fuel lines to the carb, it might need a thorough cleaning, but as mentioned, try another tank and line first to eliminate that.

[Dean1]

Thanks guys.
Will suss it out over easter. Its been getting worse over a few years, i only use it in a small creek so have put up with it.

Been a few years Noelm are you still a cat owner?
Cheers

[Noelm]

Yeah, still got the centre console 18', thinking of selling it soon though, haven't heard from you for ages, how have you been?

[Dean1]

All work no fish Noelm. But i will make a comeback one day when i have the time.
Yes been a while since i logged on here!

[TheGurn]

Check the fuel line connectors at the tank and motor. Had a mate with exactly that issue. Connectors were loose and worn. 'O' rings were shot and sucking air. Replaced the connectors and all good.

[Dean1]

Check the fuel line connectors at the tank and motor. Had a mate with exactly that issue. Connectors were loose and worn. 'O' rings were shot and sucking air. Replaced the connectors and all good. Ok mate will check that out first. Thanks for that info 👍

[Dean1]

A completely blocked fuel line will be the culprit. A blow out with compressor and starts 1st pull now best its run in years 👍👍

[scottar]

Did you check what the blockage was Dean. Not uncommon for fuel lines to break down with age. In the interests of stopping it reoccuring, replacement might be warranted.

[Chimo]

Consider changing the fuel line fitting at the motor end.

My 9.9 Mariner did similar but the problem was overcome when I changed the plug to a proper Mariner Merc fitting.
They don't seem to do well sucking air I found.

[Noelm]

All those clip on fuel fittings are prone to failure unless genuine parts are used, they cost around twice the price, but last and work 10 times better than the after market ones.

[Chimo]

Agreed.............

[ericcs]

i particularly like the grey mercury hose. it's very flexible and doesn't go stiff with age!

[Dean1]

Hey mate it looked like brown muck. Not sure what it was. It sits in a shed for long periods without use. Will keep an eye on it. Cant believe it starts first pull now. Like the day it was new 👍

[Chimo]

So what did you end up doing?

[gazza2006au]

That is generally the case mate old age and the hose going soft

[gazza2006au]

IMO there is a limited market for aftermarket parts a lot of it is really shit compared to genuine parts, i recently bought a ebay impeller from China the fins were soft towards the outer edge i than bought a genuine mercury impeller it was stiffer than Hue Heffner

[Noelm]

Unfortunately it's just fact of life, we all internet shop to find the cheapest price, and if it turns out to be rubbish, then we buy the genuine part, making the cheap copy expensive in the long run, I buy only from my local boat shop, and motor parts are always genuine, some cheap copy stuff is OK, but not motor bits and pieces (in my opinion)

[TheGurn]

The old saying "the poor man pays twice" applies unfortunately.

[gazza2006au]

Indeed that is the case i am always sucked in by the cheaper price just because genuine parts can cost 3x the amount

[catshark]

stiffer than hue heffner ..lol

[Dean1]

So what did you end up doing? I just blew it out with the compressor mate. I have some genuine mercury hose on another tank that i might use to replace. Its the grey mariner hose. Ill just keep an eye on it 👍