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09 August 2010, 19:44
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#1
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Member
Country: UK - Scotland
Town: montrose
Boat name: rib tickler
Make: Tornado
Length: 5m +
Engine: 150hp Optimax V6
Join Date: Apr 2007
Posts: 101
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Changing aFuel filter
I have a spin on fuel filter attached to the transom that requires changing.
Is it best to turn off the fuel and run the engine until it stops then change the filter or just "go for it" and replace it when it's full of fuel?
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09 August 2010, 19:56
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#2
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Member
Country: UK - England
Town: Southampton
Boat name: Hissing Sid
Make: Ross Smith Cobra
Length: 6m +
Engine: 200HP Optimax
MMSI: 235038046
Join Date: Jun 2002
Posts: 3,804
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not sure but there shouldn't be any flow with the engine off...
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09 August 2010, 20:55
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#3
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,872
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Is this a trick question?
Unscrew-remove old. Screw on new, give tit a sqeaze.
I tend to pour the contents of the old filter into a jam jar to see what it's collected. If it looks OK, I pour the 20p worth of petrol in the mower.
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10 August 2010, 16:33
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#4
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Member
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
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Quote:
Originally Posted by bazza
Is it best to turn off the fuel and run the engine until it stops then change the filter or just "go for it" and replace it when it's full of fuel?
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Won't make a difference. As the fuel is used from the filter, it's replaced by sucking fuel up from the tank.
Place a bunch of towels underneath, and have a bowl or something handy to empty the old cannister into once you get it off.
Remember to reprime the filter using the bulb before starting (filling the cannister with fresh gas before installation helps but can be messy.)
jky
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10 August 2010, 17:25
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#5
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Member
Country: UK - Scotland
Town: montrose
Boat name: rib tickler
Make: Tornado
Length: 5m +
Engine: 150hp Optimax V6
Join Date: Apr 2007
Posts: 101
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Thanks jky,
I have a tap just as the fuel line leaves the tank and I thought if I turned that off then ran the engine the fuel in the line and filter would get used then it wouldn't be so messy. However I wondered if running the system dry would cause any problems when I try and restart the engine.
Sounds like I go for the "unscrew, rescrew then squeeze my tit" solution
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10 August 2010, 18:02
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#6
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Member
Country: UK - Channel Islands
Town: A large rock
Boat name: La Frette
Make: Osprey Vipermax
Length: 6m +
Engine: 200 Suzzy
Join Date: May 2004
Posts: 2,893
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If you turn the tap off and run the engine then it'll create a vacuum which will prevent the fuel being used. Might even damage the fuel pump. However, it is still worth turning the tap off, replacing filter and then making damn sure you tunr the tap back on again. How do I know this?????
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11 August 2010, 16:36
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#7
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Member
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
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Quote:
Originally Posted by bazza
I have a tap just as the fuel line leaves the tank and I thought if I turned that off then ran the engine the fuel in the line and filter would get used then it wouldn't be so messy. However I wondered if running the system dry would cause any problems when I try and restart the engine.
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Carbed, maybe. Though as Erin pointed out, you need to allow air to replace the burned fuel. A lot of injection systems don't like being run dry (though that bit is from the early car/diesel days, and may no longer apply.)
Plus, there's probably a pint and a half of fuel in the filter and line - going to take a looong time to burn that up at idle...
Quote:
Sounds like I go for the "unscrew, rescrew then squeeze my tit" solution
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Yeah; if you had done that to begin with, you'd be done and be inside watching TV with a couple of beers inside you by now.
jky
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13 August 2010, 20:35
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#8
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Member
Country: UK - Scotland
Town: montrose
Boat name: rib tickler
Make: Tornado
Length: 5m +
Engine: 150hp Optimax V6
Join Date: Apr 2007
Posts: 101
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Okay, fuel filter changed. The missus said the last bit hurt but I told her it was necessary .
My primer bulb is after the filter, Is this normal?
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13 August 2010, 23:30
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#9
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
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Quote:
Originally Posted by bazza
Okay, fuel filter changed. The missus said the last bit hurt but I told her it was necessary .
My primer bulb is after the filter, Is this normal?
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I prefer this setup. It's how I have mine. It means if you get an air leak on a union, you don't piss fuel out as you pressurise-it just means the bulb feels 'bubbly'.
If it's a seethrough bowl you can see the air bubbles too.
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13 August 2010, 23:34
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#10
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Member
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,872
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Quote:
Originally Posted by bazza
The missus said the last bit hurt but I told her it was necessary .
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Maybe she squeazed you a little too hard.
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15 August 2010, 04:44
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#11
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Member
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
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Quote:
Originally Posted by bazza
Okay, fuel filter changed. The missus said the last bit hurt but I told her it was necessary .
My primer bulb is after the filter, Is this normal?
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It's the way mine is set up.
Some people worry about "pushing" contamination through the filter, but I don't really see any difference either way.
Actually, now that I think about it, a leaking primer bulb will be leaking cleaner fuel if it's after the filter...
jky
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