Thread: Fixing the Ultra 250 gas tank
03-12-2007, 08:04 PM #1
Fixing the Ultra 250 gas tank
Way2Fast makes a good point that probably the reason Kawa
decided to fire the fuel buzzer at 8 gallons (as per manual) or
6/7 gallons (in the field reports so far) is that the motor could
be potentially starved of fuel due to it moving around in the tank
and the pickup not being able to get that last drop effectively.
Way2Fast suggested a secondary fuel tank after the main tank
and before the injectors. How about a Racor Water Fuel Separator??
Do you think there is enough volume in this Racor water/fuel
separator? I used these on boats for the water removal, but
since they are just in front of the motor and are pressurized
from the fuel pump, maybe they would work. They would be
like a buffer. They are high quality devices. Unfortunately
I like the clear bowl at the bottom, but by CCG regs you have
to use a metal bowl in an inboard installation like a PWC. You
can use the clear ones on Outboards. You would get the
big added advantage of pulling the water out of the marina
source fuel docks.
The above referenced site also has lots of interesting gizmos, like
crankcase emission filters to handle the problem that TeamMoto
Let's put all of us gearheads together and figure out a neat solution!
03-12-2007, 09:46 PM #2
The USCG grants several exemptions to the manufacturers of PWC. One of them applies to venting the engine compartment. I'm sure there is an allowance for "non metal" fuel filter assemblies in the exemptions because every PWC I have seen uses fuel filters made of plastic which are a no-no for inboard boats. The water separator fuel filter would probably prevent near 100% of the fuel starvation issue. If it would fit in the ski I'd say it is a must have for those who ride hard and turn sharp in choppy water conditions.
Good find Tom !
03-12-2007, 09:53 PM #3
The reason I like the clear bowl is that you can see the water and
then you just turn the spigot and it drains out into hold. The metal
one is a guess, you open and see what if anything is there.
These are the primo ones. Mercury makes those spin on's that don't
have a bowl. You really never know when you should switch 'em unless
you pull them off and see if there's H2O there. Usually they tell you
to change them periodically.
Racor is the king of Diesel engine filtration. They know what's up.
03-12-2007, 10:06 PM #4
I would use the clear bowl even if it wasn't allowed under the CG exemptions...but I'm pretty sure that it would be acceptable.
03-12-2007, 10:41 PM #5
03-12-2007, 11:17 PM #6
You can also use fuel cell foam to help the fuel from moving around as much. We had to use it in our fuel injected ski back in the day, due to sucking air.
03-13-2007, 05:23 AM #7
I hate rules, but.......
I've been boarded more than once by USCG. The boys just love
to nit pik and usually have their own little hot list of things to
look for. For instance if you have a holding tank for gray water, i.e.
doo doo, and have a Y valve to discharge overboard or direct to
tank, you have to have it in the tank position within 3 miles of US
coastline. If that valve is wrong position, ticket. They also
look for the water/fuel separator and general hose conditions of your
Last week a USCG Aux told me that my SeaDoo FL numbers were not
legal since they weren't block letters. I then figured out he was trying
to get me to go through some hoops to get a safety sticker. This is
at the dock in Key Biscayne while I'm trying to launch. When I realized
it was a voluntary thing I politely told him to #$#$ off.
So, yeah clear bowel it is and I'm going to tell him two higher authorities
JS in Charlotte and Way2Fast made me do it!
03-13-2007, 07:36 AM #8
Actualy all you would have to do is quote the exemption number from the safety/info sticker on the rear of the deck (the one everyone took off) that pertains to venting and fuel and that would be enough to snow any Coastie under and nothing more would be said about a clear plastic bowl on the filter/water separator.
03-13-2007, 08:01 AM #9
That filter in the pic you posted is NOT high pressure rated. Not for high pressure fuel injected systems.
IIRR 10#psi is all they are rated for. The FI fuel pump for your kawi puts out much more than that.
Ruptured plastic fuel filter=fuel in bilge
Why not use the R&D fuel pickup solution?
03-13-2007, 08:52 AM #10
What is the PSI of the fuel system??
Good point. Seems Skip has a interesting wrinkle on the new fuel
pickup, comes with some kind of bag that acts as a buffer for air
bubbles and uses more of fuel in tank.
I see where the Racor's are rated 7psi with up to 125gph flow rate
(Ultra is 18.5 gph at WOT)
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