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  #11  
Old 12-14-2012
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Re: Fuel line shut off options?

only time I've ever turned off the fuel valve on my boat was to work on it.
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Old 12-14-2012
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Re: Fuel line shut off options?

down, in a conventional diesel setup isn't your fuel pump an electric fuel pump? That shuts when you shut the "ignition" key?

I'm thinking that once you cut the ignition, the fuel pump will shut, and unless your engine has gone runaway (which it can do by sucking crankcase oil even if there's no fuel) it will stop as the fuel is no longer pumped.

OTOH if you have a gravity-fed day tank, you'd need a positive way to cut off the fuel from it.

But the solenoid, the valve, the splits...All good in theory but even if they are done robustly and fixed solid to something, they add more failure points. You know, the more plumbing you have, the more leaks you will have.

Could you instead install an access plate, so you could reach the manual shut-off valve from abovedeck, or another angle?
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Old 12-16-2012
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Re: Fuel line shut off options?

Hello,

I am back to a linkage solution for all the good reasons being discussed here. I can easily extend a rod from the shutoff valve into the cabin adjacent to the main power panel. A push / pull when I turn the key on or off will also shut the fuel line. It will be robust, mechanical and accessible. Time to work out the details.

Down.
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Old 12-16-2012
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Re: Fuel line shut off options?

Why not follow SAE/automotive practices:

Oil pressure controlled safety switch wired to (close as possible to tank) solenoid valve (wired to elec. fuel pump on land based vehicles). With bypass (3 pole) toggle switch, to by-pass the safety switch when low cranking power doesnt generate sufficient starter rpm to create sufficient oil pressure, plus the third switch position is OFF (a hidden boat theft-preventer). On a marine engine, just "tee-in" the oil pressure safety switch to the same engine boss/port occupied by the oil pressure sensor.

Such 'oil pressure safety switches' are readily available in auto supply shops that cater to 'mechanics' and are also included in 'modernization packages' for the venerable Atomic 4 when electric fuel pumps are added.

The automotive oil pressure safety switch was mandated by SAE on US vehicles so that when a 'crash' occurs, as soon as the engine stops generating sufficient oil pressure, the electric fuel pump automatically shuts down ... rather than continuously running to feed a 'fire'. You'll definitely need a bypass (switch) across the safety switch to start an engine that already has low oil pressure during 'engine cranking'.

:-)

Last edited by RichH; 12-16-2012 at 06:04 PM.
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Old 12-16-2012
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Re: Fuel line shut off options?

Quote:
Originally Posted by deniseO30 View Post
You can get a "fusible" fuel valve. They are used on domestic fuel oil tanks.

"Product Description

Oil Equipment Mfg 2110 Oil Tank Fusible In-Line Safety Valve - Oil Tank l Water Tanks, Plastic Tanks, Poly Tanks, Storage Tanks
3/8f fsbl inln tnk valve. Fusible valves are approved for kerosene and No. 2 fuel oil. Pressure rated for 10 P.S.I. Valves with standard hand wheel close at about 165 F. ambient temperature. Double seal to prevent stem leaks. All fusible valve rubber washers and o-rings are made of Viton or equivalent material. 3/8" F.


Anywhere that sells HVAC should have them in stock.
Awesome idea! A shutoff valve that doesn't even need you aboard to work. One question though, can't the engine room get to "about 165F" under some normal operating conditions??? Seems like it would ruin your whole day if you were at WOT trying to get off a crunchy-looking lee shore somewhere tropical and your valve shut the engine down for you.

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