Splitting fuel line for twin engines

[mick]

What's that pipe attached to the transom in the middle

[mick]

Just back up Chris we have a 160 L main tank

[peterwhite]

Mick just one thing to remember if its the new mercury 150 four strokes, they must not have primer bulbs installed as it will invalidate the warranty because they have a complete fuel system unlike older engines.

[mick]

Originally Posted by peterwhite

Mick just one thing to remember if its the new mercury 150 four strokes, they must not have primer bulbs installed as it will invalidate the warranty because they have a complete fuel system unlike older engines.

It's not me its redthunder that's got the new engines.

[willk]

Originally Posted by Chris

Did you run your engines on 25 litre tanks then, no fitted tank?

No, they were switchable - main only or one or both deck tanks. It was a versatile setup and gave a visible 30Nm reserve. I used the tanks for refueling on cruises etc.

[willk]

Originally Posted by mick

What's that pipe attached to the transom in the middle

Bilge pump waste. It had an NRV on it - looked a bit odd.

[redthunder]

Originally Posted by mick

It's not me its redthunder that's got the new engines.

Yup they are the new ones. I did read that they shouldn't have prim bulbs.

[Daniel]

Marine, Automotive, and Industrial Parts and Spares - A.S.A.P Supplies

Suggest ring them up and ask for a paper catalogue, easier to browse and see what you need. very helpful company, good technical knowledge / advise too

[9D280]

Originally Posted by peterwhite

Would have to agree with the above. I would not under any circumstances run two engines from a single supply. Must be separate supplies to feed each engine.

If Redhunter has a big single tank under his deck he may not have much choice!

Originally Posted by peterwhite

It is also much safer in the respect that if you get any contamination in a tank then you always have a backup.

Absolutely agreee, I havwe separate fuel for my wee Aux - a twin setup is akin to having an Aux that will keep you on the plane (obviously might not work with a hu-u-u-u-uge rib).


Back to the general thread -

Another option instead of @rsing around with taps etc that wil linevitably corrode is to use inline OEM connectors for the "portable" setups. I standardised on the old Merc "twistlock" back when I had a Suz simply becase it was a connector I could change with cold hands an / or wearing gloves.

I'll second using a big bore hose having managed to replicate what you describe in miniature by stalling a Yam 55 a few years ago by feeding it through a 1/4" fuel line!

[redthunder]

Originally Posted by 9D280

If Redhunter has a big single tank under his deck he may not have much choice!

Yup can't change tank to twins as I'm converting a single engined boat to twins. The reason for twins engines is all my failures have been engines and gearboxes. So two was the way forward. I've never had a fuel problem as yet but will carry a small auxiliary tank in case.

[peterwhite]

Fair point ref the single tank, but I would add a separate second take off to the tank so you are using one single feed per engine and as for contamination you will have double the turnover in the tank so in theory as long as its clean to start then it should stay cleaner.

[Pikey Dave]

Originally Posted by redthunder

Yup can't change tank to twins as I'm converting a single engined boat to twins. The reason for twins engines is all my failures have been engines and gearboxes. So two was the way forward. I've never had a fuel problem as yet but will carry a small auxiliary tank in case.

To supply 2x150s at full chat via a single line will need a fair size hose. Depending on the size of the pickup in the tank you might be on dodgy ground. My 115 etecs have 3/8" individual hoses via separate tanks. I'd think you ought to be looking at a 1/2" feed if not larger (not done the maths to work out the equivalent csa) If all this is being fed via a 5/16" pickup....... If you starve the engines, they can run lean & you could melt a piston

[redthunder]

I need to buy a t connector for the fuel hose any ideas where to buy ?

[mleeee]

Why are water seperators necessary? A volume of petrol burns to produce 8 or so times the volume of hot water. Never understood this - unless it's a starting thing. (IE they start better on petrol rather than water !)

How much water gets into fuel tanks while beetling along?

Is it a part-empty tank condensation thing? - like light aircraft (which have drain test-points at low points in the fuel system to drain/inspect for water. The common Lycoming engines happily chew through some water [as you descend promptly earthwards under no power] as the prop drives the engine. Usually, they restart ...)

[PeterM]

Not 100% required but a sensible and cheap option. Boats are a little closer to water so a much bigger risk than light aircraft. Combination on condensation..hot sun, cold water around hull, and water on deck finding its way in.

I was obsessed with clearing the water when I was flying..still ended up in a field coming out of Bembridge...and had a scary scary climb (just) coming out of Southampton in an Archer... :-(

[Pikey Dave]

Originally Posted by mleeee

Why are water seperators necessary?

Because it phuqs up the injectors on modern DI engines along with all the other crap that accumulates in the bottom of the tank. Good water separating filter (Racor) = £60 quid, replacement injector = £300-£600 quid + lost time on the water & embarrasing call to CG requesting tow, go figure

[AlTait]

Hi.
You may have a problem with the Racor not being able to supply enough fuel to both engines as higher RPM and especially as the Racor starts to get dirty. You may fine you go though more fillers than you need to also.
You will notice the fuel ball suck flat.
You can do it as a stander Racor has two inlets and two out lets but better with twin Racors .I have snap fittings so I can use both Racor's on ether engine or alone etc etc. without having to have fuel leavers everywhere. I also have twin tanks so yours would be even simpler.

Hope that of some help.

Al

[Pikey Dave]

Originally Posted by AlTait

Hi.
You may have a problem with the Racor not being able to supply enough fuel to both engines as higher RPM
Al

This one will deliver 60gph, you can go upto 90gph if needed

[martini]

Originally Posted by redthunder

I need to buy a t connector for the fuel hose any ideas where to buy ?

ASAP SUPPLIES MOST LIKELY.

JUST FOUND SHIFT LOCK ON MY IPAD ONLY TAKEN ME 2 YEARS

[redthunder]

Originally Posted by martini

ASAP SUPPLIES MOST LIKELY.

JUST FOUND SHIFT LOCK ON MY IPAD ONLY TAKEN ME 2 YEARS

Great thanks