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Post by Deleted on Feb 1, 2018 17:08:01 GMT
My new yot has a Kubota marine twin cylinder diesel engine. Engine is perfect but the fuel system is odd. Its got a priming bulb because the fuel tank is not above the engine. Normally you would see a lift pump.
Has anyone seen this before ?
Engine ran fine yesterday for an hour without priming. Today it stopped after about 20 minutes. Bleeding via injector nuts sorted it out.
Is it an indication of a potential problem (engine runs perfectly once bled) or could it be an anoraky type of installation belt and braces etc? Occurred to me a possible fractured high pressure pipe somewhere but i'm not sure because it worked fine yesterday after a few weeks of storage on land. Maybe boat going back in water complicated things due to boat being more down at the stern than when it was on the trailer ?
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Post by Deleted on Feb 1, 2018 17:13:53 GMT
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Post by Deleted on Feb 1, 2018 17:38:51 GMT
I've got one of those in a box as I bought a spare for one of my generators. I did wonder if that was the solution. Thanks for confirming that it is  |
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Post by cygnus on Feb 1, 2018 17:41:18 GMT
I don't think rubber priming bulbs are allowed for BSS. You can get fuel filters with the priming button on Beta engines and such.
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Post by Deleted on Feb 1, 2018 17:44:34 GMT
I don't think rubber priming bulbs are allowed for BSS. You can get fuel filters with the priming button on Beta engines and such. They are fine to prime the system, but no good to lift the fuel from a tank that is lower than the injector pump. The diaphragm is also prone to splitting in old units giving rise to air leaks and difficult starting. |
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Post by Deleted on Feb 1, 2018 17:46:23 GMT
I don't think rubber priming bulbs are allowed for BSS. You can get fuel filters with the priming button on Beta engines and such. My Beta 90 on the barge has one of those priming buttons. Quite handy. The twin filters on this boat are fitted below the engine. Someone did suggest to me fitting another filter with this priming thing on it. That would mean 4 fuel filters. Might be worth looking at but i'm a bit tempted to fit a small tank under the side deck with a filler pipe and vent and call it the main tank then transfer diesel from the existing tank to that one as a "day tank" arrangement. |
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Post by Deleted on Feb 1, 2018 17:47:42 GMT
I don't think rubber priming bulbs are allowed for BSS. You can get fuel filters with the priming button on Beta engines and such. They are fine to prime the system, but no good to lift the fuel from a tank that is lower than the injector pump. The diaphragm is also prone to splitting in old units giving rise to air leaks and difficult starting. Are you saying the BS scheme would pass it on a diesel inboard? The top of the tank is about the same level as the injection pump but that depends on boat trim. Of course as the tank empties the stern comes up a bit so it could just be a balancing act with this particular boat. |
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Post by Deleted on Feb 1, 2018 17:56:58 GMT
They are fine to prime the system, but no good to lift the fuel from a tank that is lower than the injector pump. The diaphragm is also prone to splitting in old units giving rise to air leaks and difficult starting. Are you saying the BS scheme would pass it on a diesel inboard? The top of the tank is about the same level as the injection pump but that depends on boat trim. Of course as the tank empties the stern comes up a bit so it could just be a balancing act with this particular boat. No, I meant the filter heads with a primer button. |
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Post by tadworth on Feb 2, 2018 1:54:26 GMT
It must have a lift pump. The bulb just manually primes the system.
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Post by Deleted on Feb 2, 2018 12:37:58 GMT
It doesn't have a lift pump. To be fair the tank is higher then I originally described so it is working on gravity feed but I don't think it'll do that with half a tank of diesel. The priming bulb is probably for when changing fuel filters I imagine. . Does seem a bit odd. I'll see what the bss man says about the fuel system and either plumb with copper and iso7840 pipe and a facet pump or just put in a day tank.
Its a slightly odd arrangement.
seems quite likely that the fuel tank is not original and there wasn't space to get it any higher up. Still don't understand why no electric pump in the system but if original tank was higher up no pump would have been needed anyway..
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Post by peterboat on Feb 2, 2018 12:50:35 GMT
The Injection pump may have a small lift pump in it? they did on cars
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Post by Deleted on Feb 2, 2018 13:02:42 GMT
Its a Kubota Marine engine. (Not a marinised Kubota engine like a Beta or a Nanni - its a Kubota Marine) I have read on other forums that the same engine was branded as "Universal marine engine" and that they also did not have lift pumps. I'm beginning to think the boat may have had a day tank previously but was removed for some reason maybe it was mild steel and rusted out or something. The fuel pipework looks recent but its not a bss modification. Its a bit odd but have run engine today for an hour and it was sweet as a nut. Trip through pool of London tomorrow is going to expose any faults. I've got a big anchor with a lot of chain and warp ready...
Anyway I've got the tools to bleed and sort it I its necessary again. I don't think it'll be a problem but it is a bit of an odd arrangement.
I'll take an electric fuel pump and a rubber hose cutter and a little battery in case I get caught out and need to provide positive pressure to the injection pump.
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Post by alex on Feb 2, 2018 13:37:01 GMT
Canal river rescue put a bulb on my engine as he had no spare facet pump with him , he advised I could just stay with that or get new facet , only warning was if I go on river and needed to use lot of revs fit the facet pump , bulb would not feed enough fuel for high rev use.
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Post by Deleted on Feb 2, 2018 13:38:22 GMT
The Injection pump may have a small lift pump in it? they did on cars It's a little in line iskar pump, no lift on them. |
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Post by Deleted on Feb 2, 2018 14:35:45 GMT
Canal river rescue put a bulb on my engine as he had no spare facet pump with him , he advised I could just stay with that or get new facet , only warning was if I go on river and needed to use lot of revs fit the facet pump , bulb would not feed enough fuel for high rev use. That's interesting. I would have thought the bulb would just allow free flow of fuel through and the only potential problem would be the head of fuel in the tank. Or maybe the bulbs do restrict flow ? I assumed when I saw it that I was to do with priming after filter change(s). The boat has a Racor900 (overkill) filter and two smaller FRAM spin-on filters but the latter are well below the engine for some reason (under the boards). As I said its an odd arrangement but everything else about the boat is seriously Belt n Braces so I feel there must be a reason for it. |
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