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Old 01-08-2010, 18:45   #1
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Perkins 4107 Fuel Lines

I have a problem with my Perkins 4107 fuel lines.

The original fuel filter installed and bolted to the engine is in a poor location, with a large water tank butting directly onto the bottom of it.

Long story short, there is not enough room to remove the filter without taking off some of the metal fuel lines into the filter. Not only is this a pain in the arse, but almost impossible to seal the leaks as these lines have been untightened, bent, retightened once too many times. The CAV housing is also bent a bit and difficult to get a complete seal.

This CAV housing is located inline between the lift pump and the injector pump. The return from the top of the injectors also is plumbed back into this CAV housing.

I wish to replace this filter. I am thinking to replace the entire filter setup with a 3-way tee. Would use flexible hose. Was thinking just chop the ends off the three metal fuel lines that enter the CAV housing, and push appropriate sized flexible hose over the top, then hose clamps.

Is this acceptable, will this work.
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Old 01-08-2010, 19:40   #2
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You really need to order new lines if this is the case..

Will your way work?...probably...but it is asking for trouble!.

Engine vibration will take its toll on those connections...leading to fuel leaks and air leaks...a boat is no place for Jerry rigging of a fuel system in anything but emergency situations.

If the C.A.V. head is buggered, toss it as well and start over with a modern one designed for canister screw on filters if yous isn't converted over to except those already.

Ya I know diesel isn't all that flammable your thinking so whats the big deal...believe me a bilge full of diesel is no picnic either...and usually leaves a permanent lingering diesel smell if it contacts any wood....secondly Murphy's law says that one of those connections will part at the worst possible time....it could cost you your boat or worse.

Spend the $$ get her done right...and mounted in a serviceable orientation on the engine with a stand off bracket if necessary allowing easy filter changes...the piece of mine is priceless..
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Old 01-08-2010, 19:44   #3
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+1 on Stillraining's post
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Old 01-08-2010, 19:44   #4
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Quote:
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If the C.A.V. head is buggered, toss it as well and start over with a modern one designed for canister screw filters if yous isn't converted over to except those already.
Happy to buy new CAV head. But I want to mount it somewhere more accesssable and user friendly. Trying to work out the best way to replumb the lines.
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Old 01-08-2010, 19:49   #5
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I had edited my post adding that suggestion before I finished with it...

Nothing wrong with using flexible lines for a remote mount...just as long as they have the proper fittings....were not talking hose clamps here..
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Old 01-08-2010, 19:52   #6
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You will need some kind of flair on the hard line to keep the flex line from sliding off. Better to get proper flexible fuel lines made up that will replace your hard lines and run to your new filter location. Some of the new common rail engines have a side mount on the engine that keeps the filter away from the engine a little making it much easier to change the filter from in front of the engine.
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Old 01-08-2010, 20:08   #7
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does it matter if the filter goes before or after the lift pump.
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Old 01-08-2010, 20:16   #8
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You want it after...not many lift pumps will "lift' well though a filter....and the more contaminated the filter gets the less it will be able to do it.
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Old 01-08-2010, 20:24   #9
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The primary filter (on engine) is a "pressure" filter.
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Old 01-08-2010, 20:30   #10
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"The primary filter (on engine) is a "pressure" filter. "

Curious... The previous owner installed a new CAV between the tank and the lift pump, and i suspect never changed the filter on the engine.

So currently there is two CAV type filters, one after and one before the mechanical "lift" pump.

After filter change and stuffing box repack, I get 200rpm (10%) more out of the engine. I wonder where this improvment came from?
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Old 01-08-2010, 20:33   #11
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Is it common to replace the mechanical lift pump with an electric one?
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Old 01-08-2010, 20:36   #12
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Yes quite common...I have an electric and it is before my raycor and my secondary filters....Makes bleeding a cinch....but some people don't like the noise..it is a bit annoying.

I have a blanking plug over where the mechanical once resided.
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Old 01-08-2010, 20:59   #13
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The electric fuel pump should be between the Raycor (secondary) and CAV (primary) filters. The Raycor filter is designed to operate on the vacuum side of the pump.
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Old 01-08-2010, 21:07   #14
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Like I said, my engine has 2 CAV type filter, no RACOR type filter....

What is the difference? What is the purpose of having the two.
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Old 01-08-2010, 21:32   #15
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Quote:
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The electric fuel pump should be between the Raycor (secondary) and CAV (primary) filters. The Raycor filter is designed to operate on the vacuum side of the pump.
Only the turbine series not the older primerless 200 or 400 series which I have....cant remember which it is I have now.
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