R27ob - useable fuel capacity

[Jcat2010]

Anyone have any idea how far you can draw down the fuel tank before the gauge starts blinking?
I've never planned to draw down below 1/3, but no idea what the real limit is if I ever need that "reserve".
Per Yamaha, the gauge should start blinking at around 15 gallons; anybody know for sure?

 

[Submariner]

It’s 147 gallon tank per the label on the top of the tank. I say it’s 150 to keep the math easy.

I’ve been down to 25 gallons left. I know someone else in an R27-OB whose been as low as 15 gallons.

We don’t use the Yamaha gauge though. It’s there. With its dash’s. The Garmin is more accurate.


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[johnbenj]

We don’t use the Yamaha gauge though. It’s there. With its dash’s. The Garmin is more accurate

I agree with you Martin. Though, while the Garmin displays more precision, you have to set the qty of fuel accurately or else.

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[Submariner]

We don’t use the Yamaha gauge though. It’s there. With its dash’s. The Garmin is more accurate

I agree with you Martin. Though, while the Garmin displays more precision, you have to set the qty of fuel accurately or else.

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I don’t look at the Yamaha gauge as a precision instrument.

It’s just a routine at the fuel dock. “Fill up all tanks” to reset the Garmin back to 150.


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[Maggie Anne]

We could use some math to take a stab at this question if we knew the dimensions of the gas tank. I don't know what the actual size is but a tank that was a perfect cube 2.7 feet on a side would hold 147 gallons. Then how low could the fluid level get before the fuel pickup (located on the bottom of the tank) would not be able to suck up the gas. Given a 2.7 ft square base and 2 inches left of fuel, I calculated that would represent about 9 gallons and one inch of fuel left would be half of that so 4.5 gallons. If the tank was tilted so that the the low part of the tank would be at the fuel pickup I presume you could probably get almost all of it out? If it was tilted the other way then maybe more remaining before you started sucking air.

 

[Jcat2010]

Thanks all. I'm looking for that realistic number, somewhere between 25 and 15 sounds about right to me. I want to stay well away from where it breaks suction because there's too much risk of wrecking the vst pump and injectors. Where the pickup breaks suction is good to know, for reference. I'd be interested in that too if anyone has empirical info, otherwise I'll let you know what i come up with when i pump it dry in late November.

Joe