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Floscan Twinscan Installed Functioning Ok

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brian_from_boston

Contributing Member
"So once again a 1988 29'

"So once again a 1988 29' Blackfin Flybridge with twin 454 model 350 inboards. I installed Floscan Twinscan got everything wired and started it up. I am getting 1.5 gph @ 500 rpm on the starboard and 2 gph @ 600 rpm on the port. I took her out on saturday and found that the starboard motor seems to burn 2gph less than the port. I also noticed that when I give it throttle it surges up then settles. I.E. cruising at 1500 rpm, I throttle up to 2200 rpm and the gauges go to 13-15 gph port and 10-13 starboard. They then settle back down to 10 gph port and 8 gph starboard approximately 10-20 seconds after throttle up.

Is this surge normal?

Any thoughts on why one motor burns 2gph less than the other at the same rpm?

I am going to replace all the filters and see if there is a change."
 
"I get the same surge, I think

"I get the same surge, I think is actually using more fuel to get up on plane and then reduces some.

I get the same discrepancy of about 1-2 gph, but on mine it is the port that is lower. No idea why though. I have heard a reverse rotation engine burns slightly more fuel but no idea if this is true.

What kind of numbers are you burning at 3000rpm or so? What do you usually cruise at?"
 
"I was burning 12-13 gph port

"I was burning 12-13 gph port and 10-11 gph star (I think that is what it was) at 2800-2900 RPM and 17-18 knots. I am planning on going on a good cruise this sunday so I'll post those numbers early next week. RM, the filter attached to the motor did you say that it unscrews like an oil filter? I plan on changing that this week."
 
"Brian:

I saw about that mu

"Brian:

I saw about that much variation on mine as well. Cleaned the flame arrestor and the thirsty motor started behaving. That said, it seems like a high fuel consumption. My Chrysler 360s burn 8 to 9 GPH at 2,500 rpms.

Suggest you calibrate the system by filling the tanks (ugh!)running it for a few hours, then refilling (Ugh again!) and seeing how much fuel it actually used (compared to the totalizer readings). That's the only way you can set up the unit for actual fuel usage.

Finally, the jumping around bit could be air leaking into the system. My fuel shutoff valves--though they don't leak a drop of fuel--allowed enough air to enter that it drove the flowmeter nuts! Had to relocate the flowmeter BEFORE any valves to correct it.

Jeff

PS: THe difference in fuel usage per motor is what a FloScan is all about! You use that info to correct gas robbing problems."
 
"With the deep-v and heavy hul

"With the deep-v and heavy hull the Blackfin has those numbers should be right.

Yes should be able to unscrew the canister by hand and there is a small filter inside it. Inspect the canister when off sometimes they need to be replaced, not real $$$ though."
 
"Thanx guys,
I changed th

"Thanx guys,
I changed the Fuel water separator's (NAPA 3225) not too confident on this one though it is just like an oil filter. I am wondering where the water goes after separation???? I want to look into another style separator. I changed those cannister fuel filters also. Wow it was like they were epoxied on. I had to remove the lines and the whole filter assembly so I could get enough torque to loosen. I will get back to guys on the fuel usage after Sunday, going 20 miles out to Stellwagon Bank for Cod and Haddock.

Jeff,
I am planning on fueling up next thursday and comparing the difference between the totalizer and what goes in. The tank was topped off prior to floscan installation. I think I have spent over $3500 in floscan, belts, hoses, plugs, filters, buffer .... in the past 2 months. Does it ever end UGGHHH? Hopefully it will pay off with some good fishing this weekend."
 
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