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[camper]

How much fuel can those babies burn in an hour?

[alwaysfishn]

5 to 12 gallons per hour plus.

[tnt]

pretty common question in regards to jet boats... a 19 ft with say a 350  will burn on average..4.5-7 GPH depending on how you drive it... at cruise you will be traveling 27-31 MPH so your travel time is typically short.. depending on where you want to go...average day is 30-50 dollars in fuel...

[dereke]

  Thats actually not near as bad as I thought. Had heard they are gluttons when it come to fuel consumption.

[tnt]

  Thats actually not near as bad as I thought. Had heard they are gluttons when it come to fuel consumption.

it really depends on the boat... HP, Pump, hull design and load capabilities...

[canso]

the most fuel efficient jet will still cost 20% more in fuel then an average prop.


prop will always have more torque and hp put to the water.

[Brian]

I was told that 40hp jets use a 60hp engine, fwiw.

[tnt]

the most fuel efficient jet will still cost 20% more in fuel then an average prop.


prop will always have more torque and hp put to the water.

i dont think this is really true... a 115 Hp out board on a 20 ft boat will burn 4.5-6.5 GPH at cruise.... at WOT they will burn 9-10GPH hr max speeds of about 38MPH... a 20 ft inboard Jet with a 350 PFI at WOT burns 11.5 GPH at a max speed of 48MPH.... not that far from each other ... when really looking at it...these are all numbers we have ran on our DTS systems for our boats...
 once you start changing pumps and impellors in the jet boats you can pick up a lot more performance...
Jet boats are not the way they used to be....

[Morty]

I have a 19' North River with a 175 Sport Jet.  I usually run at about 90% full throttle and burn 20 litres per hour. 

To put a bigger perspective on that most runs aren't very long - I-22 to Grassy is only 15 minutes.  Just checked my log and in three years of use, 48 outings have run just under 18 hours per year.  That's cheaper than golf gree fees, and way more fun! 

[alwaysfishn]

I have a 19' North River with a 175 Sport Jet.  I usually run at about 90% full throttle and burn 20 litres per hour. 

To put a bigger perspective on that most runs aren't very long - I-22 to Grassy is only 15 minutes.  Just checked my log and in three years of use, 48 outings have run just under 18 hours per year.  That's cheaper than golf gree fees, and way more fun! 

Are you certain of your numbers? That's only 4.4 gallons per hour at 90% throttle. Pretty efficient.

I have an 18.5 with the 200 sport jet. At 90% throttle I'm burning about 8-9 gallons per hour.  I usually run it at about 35 mph(GPS) and according to the smartcraft gauge it burns about 6.5 gallons per hour.

[JBB]

Went out with a group with Vic Carraro and his boat ( big boat, big engine ) burned a liter/minute at full chat.

[canso]

i dont think this is really true... a 115 Hp out board on a 20 ft boat will burn 4.5-6.5 GPH at cruise.... at WOT they will burn 9-10GPH hr max speeds of about 38MPH... a 20 ft inboard Jet with a 350 PFI at WOT burns 11.5 GPH at a max speed of 48MPH.... not that far from each other ... when really looking at it...these are all numbers we have ran on our DTS systems for our boats...
 once you start changing pumps and impellors in the jet boats you can pick up a lot more performance...
Jet boats are not the way they used to be....

no matter how you put it, the jet will never have the traction of a prop, making them less efficient.

I've run drag boats off and on for many years, we were playing with adjustable nozzle diameters to help with top end but they still lack the performance of a prop.

All I'm saying is, "a jet boat will burn more fuel then a prop boat."

you can pump out all the #s you want

but i will still run further and faster in my prop boat, for the same amount of fuel.

[tnt]

no matter how you put it, the jet will never have the traction of a prop, making them less efficient.

I've run drag boats off and on for many years, we were playing with adjustable nozzle diameters to help with top end but they still lack the performance of a prop.

All I'm saying is, "a jet boat will burn more fuel then a prop boat."

you can pump out all the #s you want

but i will still run further and faster in my prop boat, for the same amount of fuel.

I ll bite my tongue

[camper]

I asked the original question about how much do these babies burn because I had just bought a 19' thunder jet with a 4.3 vortec engine and was alittle surprised when I hit the gas station for the first time after about 4-5 hours use, probably getting about 7-8 gal per hour. Anyway I guess a (this boat don't run on thanks) sticker is in order.

[tnt]

the 4.3 will work a lot harder to keep the same sized boat on step compared to a 350, a lot of people buy them thinking they are more fuel efficient... but in the end they realize that it will take a few hundred RPM to run the same way... camper you might want to look at a different impellor for that Motor...