Diesel Filtration Question

[Declanor]

Hi all,

Im suffering from a blocked fuel system on my Delta 7.7 with twin Yamaha ME420's. She hasn't been used in a few years so thinking i have a sludge issue. Put briefly she has 4 x 40 gallon tanks running into what seems like a water separator???, one port one starboard, then into a Separ 2000/5 again one each side. From there fuel runs into a small(approx 1 gallon) surge tank each side before hitting the engine filters.

Basically looking for any advice. My plan is to pump as much as possible out of the tanks and change filters(x4). Are the alloy bowls before the Separs likely to be filters or what?

Any diesel gurus out there?

[Courageous]

Beware it might be the diesel bug! I hope not for your sake as it can sometimes be quite difficult to eradicate.

[Declanor]

Originally Posted by Courageous

Beware it might be the diesel bug! I hope not for your sake as it can sometimes be quite difficult to eradicate.

I suspect it is! The Separ filers are very cloudy..

[biffer]

How do you know it's block. I would disconnect the engine from the fuel lines. Have a go at running up the engines from a portable fuel tank and if they run up work your way back to the tanks. All the filters will need changing. The manifold tanks will have the flow and return in them so if the engines fire don't forget the returns will need catching I think that's enough for you to get on with

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[Declanor]

Originally Posted by biffer

How do you know it's block. I would disconnect the engine from the fuel lines. Have a go at running up the engines from a portable fuel tank and if they run up work your way back to the tanks. All the filters will need changing. The manifold tanks will have the flow and return in them so if the engines fire don't forget the returns will need catching I think that's enough for you to get on with

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Defo enough Biffer! She idles very nicely and revs but will die after a 30 seconds or so. Both engines are the same.

[Declanor]

Access to the bowls before the Separs is very limited due to been aft of the battery boxes. Are they likely to be filters or just water separator bowls?

[Courageous]

Not familiar with these engines but sounds like they could be either. You'll know soon enough after you've removed them as remove them it seems you should.

separ 2000/5 - Google Search

[biffer]

Do like I said. Running them on a remote fuel source will tell you if the engines are ok. You can work your way back to the tanks

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[Courageous]

Do any of the images on this page show the item you are referring to?

Yamaha ME420STI Sterndrive - Diveworks Charters, Fishingdownunder, Whakatane, New Zealand

[Courageous]

Biff IS absolutely right though - the first place to start is with a jury rig fuel supply

[Declanor]

That's what I'll do so. Will report back progress. Engines both sound great but won't rev for extended periods.

[Courageous]

Don't rule out an airlock as well.........

[Declanor]

This doesnt look very nice, does it?

[bedajim]

No

Are the fuel lines flexible and easy to get to?

If yes I'd throw the old ones and fittings and start again after you've pumped the old fuel out pump it out through an inline filter and the same again with a new filter when you pump it back in after cleaning the tanks.

Jim

[Declanor]

The lines from tanks(4no) are under the deck and pretty inaccessable id guess. Lines in the engine bay are easy enough to get to. I think i will jury rig and go from there. Change filters, clean tanks and try again!

[bedajim]

Originally Posted by Declanor

The lines from tanks(4no) are under the deck and pretty inaccessable id guess. Lines in the engine bay are easy enough to get to. I think i will jury rig and go from there. Change filters, clean tanks and try again!

Unless you can pull a new line in by attaching it to the old one you pull out?

How much fuel do you have in the tanks ?

Jim