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05 September 2012, 14:27
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#1
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Member
Country: UK - England
Town: Sussex
Boat name: Bombard
Make: Aerotec 380
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 3,499
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Fuel priming bulb not getting hard?
Noticed this yesterday when starting - pumped the bulb as normal but it did not get hard despite lots of trying. Both connections are good and engine ran OK but does this indicate there is a hole somewhere?
Trying at home today with the engine side disconnected same result. Depressing valve and fuel certainly pumps out OK (all over my feet....).
If so what is the best way to find the problem section?
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05 September 2012, 14:41
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#2
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Member
Country: UK - England
Town: Fareham
Boat name: Red Dog
Make: Porters Renegade
Length: 6m +
Engine: 150 HP Yamaha
Join Date: May 2010
Posts: 610
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Quote:
Originally Posted by Max...
Noticed this yesterday when starting - pumped the bulb as normal but it did not get hard despite lots of trying. Both connections are good and engine ran OK but does this indicate there is a hole somewhere?
Trying at home today with the engine side disconnected same result. Depressing valve and fuel certainly pumps out OK (all over my feet....).
If so what is the best way to find the problem section?
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Quickest and cheapest is replace the pump, sounds like the one way valve may have gone>
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05 September 2012, 15:29
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#3
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Member
Country: UK - England
Town: Littlehampton, W Sx
Length: no boat
MMSI: 235101591
Join Date: Jan 2012
Posts: 732
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I believe this is age-related and not uncommon. Have you tried asking someone else to help and see if this makes a difference? Don't worry about it - that will only make things worse. Try again after half an hour or so.
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05 September 2012, 15:33
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#4
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Member
Country: UK - England
Town: Bucks
Boat name: Blue & Ding Dong
Make: Ribeye,SR4 & Bombard
Length: 6m +
Engine: 115,50 & 15Hp Yams
Join Date: Feb 2004
Posts: 3,252
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Are you pumping it the right way up?
So fuel is drawn in the bottom & comes out the top?
But I would agree to replacing it as a easy fix!
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05 September 2012, 15:35
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#5
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Member
Country: UK - Wales
Length: 3m +
Join Date: Jul 2012
Posts: 94
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Quote:
Originally Posted by Wightdiver
Quickest and cheapest is replace the pump, sounds like the one way valve may have gone>
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What he said
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05 September 2012, 15:38
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#6
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Member
Country: UK - England
Length: no boat
Join Date: Jun 2011
Posts: 543
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My bulb is only firm and not hard, got an engineer to look at it, and he said it was 100% A-OK.
Maybe that is just how it should be.
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Will.
"By skill not force."
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05 September 2012, 15:51
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#7
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Member
Country: UK - England
Town: Sussex
Boat name: Bombard
Make: Aerotec 380
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 3,499
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Honestly, ask an innocent question!
Nick - yes, it's connected the right way...!
But...just went back again to re-try and it's hard as a hard thing now...maybe a fault with the connector after all?
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05 September 2012, 16:01
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#8
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Member
Country: UK - England
Town: Bucks
Boat name: Blue & Ding Dong
Make: Ribeye,SR4 & Bombard
Length: 6m +
Engine: 115,50 & 15Hp Yams
Join Date: Feb 2004
Posts: 3,252
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Quote:
Originally Posted by Max...
Honestly, ask an innocent question!
Nick - yes, it's connected the right way...!
But...just went back again to re-try and it's hard as a hard thing now...maybe a fault with the connector after all?
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Sorry not what I ment, if the in side is higher than the out this can cause the same problem!
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Member of SR4 club
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05 September 2012, 16:37
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#9
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Member
Country: UK - England
Town: Sussex
Boat name: Bombard
Make: Aerotec 380
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 3,499
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Sorry Nick, I should not have doubted you! 
Yes, all set up the right level etc.
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05 September 2012, 20:23
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#10
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Member
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,671
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Bulb not going hard can only be down to one of two reasons:
Inlet valve not sealing so fuel being pumped back to the tank
Leak somewhere in the engine.
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05 September 2012, 22:30
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#11
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Member
Country: UK - England
Town: NW& wherever the boat is!
Boat name: depends on m'mood!
Make: Humbers/15-24m cats
Length: 6m +
Engine: etec130/big volvos
MMSI: many and various
Join Date: Nov 2001
Posts: 1,816
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pumpin with the bulb vertical and not horizontal ?
So that gravity helps the valves shut.
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06 September 2012, 01:10
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#12
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Member
Country: UK - England
Town: yorkshire
Boat name: little vicky
Make: avon ex RNLI
Length: 3m +
Engine: tohatsu
Join Date: Mar 2008
Posts: 2,310
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As wavelength just said ,,, pump it vertical , most have 2 ball type one way valves fitted at each end of the priming bulb
Sometimes the non return ball or plug can just stick or not seal up proper allowing fuel to run back into the tank ,, sometimes if you squeeze the bulb too hard when priming and the bulbs been empty it can then generate an air bubble which can cause the valve to pass fuel back as most valves will seal with fuel but not air ,, best thing as was said is to hold it upright ,
There's also usually a very tiny non return valve in the fuel pump Diaphragm on the engine that can stick .
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07 September 2012, 17:17
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#13
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Member
Country: Finland
Town: Helsinki
Boat name: SR 5.4
Make: Avon
Length: 4m +
Engine: Toh1 3,5 Yam 90/2S
Join Date: Oct 2009
Posts: 919
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Not sure, but if the float needle in the carb is not shutting properly, would not that also result in a soft bulb?
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fun on a boat is inversely proportional to size...sort of anyway
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07 September 2012, 17:26
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#14
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Member
Country: UK - England
Town: Sussex
Boat name: Bombard
Make: Aerotec 380
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 3,499
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Thanks for all the input chaps - after this I'm pretty sure the prob is external and likely an issue with the valve so will check it out further.
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07 September 2012, 17:39
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#15
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Member
Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider 450 Rib
Length: 4m +
Engine: Tohatsu 5/18/30 HP
Join Date: Sep 2007
Posts: 1,998
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Quote:
Originally Posted by C-NUMB
Not sure, but if the float needle in the carb is not shutting properly, would not that also result in a soft bulb?
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Will have a soft bulb + a carb flooding fuel constantly all over pan...
Happy Boating
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07 September 2012, 19:07
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#16
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Member
Country: UK - England
Town: Portland, Dorset
Make: Ribcraft
Length: 6m +
Join Date: Aug 2009
Posts: 408
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I still don't get why this works - but with mine sometimes you have to pump it really slowly as 'normal' priming doesn't seem to pull the fuel through. If you squeeze it and let it out as slowly as possible that will sometimes do it.
Sorry, I can't find a way of making that sound not dirty, in my mind anyway.
It may be a sign of an underlying problem, it's a mercury barb connector on a Barrus tank.
Glad you've got it sorted anyway 
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