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28 September 2016, 09:24
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#1
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Member
Country: UK - England
Town: Bideford
Make: Bombard Aerotec
Length: 4m +
Join Date: Aug 2014
Posts: 328
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Two engines off one tank
Hi all
Just bought a 4hp johnson outboard to use as a backup/instead of my main mariner engine on my SIB. Rather than making up a completely different fuel line and primer bulb, I was thinking of using my existing mariner fuel line, putting a y connector in the line near the engine end and attaching a johnson fuel connector to the branch. Anyone think of any issues with doing this? Any suggestions also where I might find a suitable Y connector also..
Cheers
Simon
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28 September 2016, 09:46
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#2
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Member
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,743
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i did something similar in reverse one engine two tanks.
off a y piece with a quarter turn valve in to isolate one tank in your case both engines unless you rely on the connector to stop air being drawn in to be safe i would put two valves in one in each leg.
or swap out the connector on the Johnson for a mariner one and have them the same just one line then.
try Ron hale marine for parts or just eBay i did for the valve got a plastic one works a treat never had any issues
cheers
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28 September 2016, 10:14
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#3
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RIBnet admin team
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 13,053
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Quote:
Originally Posted by simonafloat
...Rather than making up a completely different fuel line and primer bulb...
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...which would be an excellent spare fuel line and primer bulb for your primary engine?
Nope, better to have two engines and one primer bulb. What could possibly go wrong?
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28 September 2016, 10:18
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#4
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Member
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
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Depends on what kind of failure you're trying to recover from.
Aux motor is in case the main gives out. If it's a mechanical or electrical issue in the main engine, fine. The backup will get you home (slowly.)
If it's bad fuel or a problem with the fuel line towards the tank, you've now got 2 motors that won't run.
Personally, I'd go for 2 completely isolated systems, but that does take up space and costs a bit more.
As I said, it depends on what problems you're trying to avoid.
jky
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28 September 2016, 12:51
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#5
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Member
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,743
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Must admit I have a spare complete line with me all the time reinforced by the fact I had a bulb failure at the head on loch etive once.
Two separate systems best your Aux internal tank will last a fair while why not buy a small 12 Lt tank for the Aux
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28 September 2016, 15:33
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#6
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Member
Country: UK - England
Town: Bideford
Make: Bombard Aerotec
Length: 4m +
Join Date: Aug 2014
Posts: 328
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Yes, two separate lines sounding like the safest option. Do primer bulbs just fail suddenly then?
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28 September 2016, 15:39
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#7
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RIBnet admin team
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 13,053
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Quote:
Originally Posted by simonafloat
Do primer bulbs just fail suddenly then?
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They can do. Some are better/less prone than others. If you can raise your tank/s to engine height then it's not such a concern but essentially the NRV aspect of the bulb can fail/block.
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"Who knows what evil lurks in the hearts of men?"
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28 September 2016, 16:14
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#8
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Member
Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 3,424
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>>> Do primer bulbs just fail suddenly then?
The one on my 6mth old Suzuki fuel line just has. I always carry a spare new bulb/line assy with me in the SIB as part of the essentials bag. Just from personal experience I've found the Quicksilver line/bulb assys to be the best made.
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28 September 2016, 17:11
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#9
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Member
Country: USA
Town: CA
Make: Zodiac RIB-P
Length: 7m +
Engine: Suzuki 250
Join Date: Aug 2010
Posts: 1,131
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I watched a guy get an 18 mile tow last weekend because he had fuel system issues. Main engine and kicker wouldn't stay running. He was assuming it was a clogged or broken filter. No commercial tow people around us. Guy fishing next to me jumped on that grenade and towed him back. I was next in line but had just gotten there and had two young boys with me so wasn't jumping at the opportunity of a 4 hour tow.
Jason
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28 September 2016, 18:52
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#10
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Member
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
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Quote:
Originally Posted by Bigtalljv
I watched a guy get an 18 mile tow last weekend because he had fuel system issues.[snip] I was next in line but had just gotten there and had two young boys with me so wasn't jumping at the opportunity of a 4 hour tow.
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USCG towed a friends boat from Carmel to Monterey Harbor (something like 6 or 7 miles?) They didn't play around; the tow was done at about 23 to 25 mph.
Ended up the problem was trying to use a jetski killswitch key instead of the Honda (on the same keyring for some reason.) Needless to say, this fact was kept from the CG.
jky
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