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Old 04 June 2003, 11:18   #1
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OMC fuel flow problems

HI there,
Just wondering if you can help me out with some pointers.

I`ve got a OMC (Johnson) 140hp O/B which is connected to a primer bulb then a diesel/water seperator to bayonet connector and then on to a 75 gal poly prop deck tank. The pipes are all USGC approved and appeared to be in good condition as too are the bayonet connectors.

When the boat has been warmed up at tick over and then used at over 3/4 throttle it dies back after a few mins as if its suffering from fuel starvation. Once when this happened I spotted the primer bulb deflated. The engine restarts immediately without priming.

As I was out for the day, I swapped to a normal 25L deck tank, removed the seperator and the primer bulb. It then worked, not missing a beat for the rest of the day.

Is it likely to just be the primer bulb valves gone (Although it looks in good condition and works when blown through the wrong way) or is it some kind of air lock?

Has anyone got any suggestions?

Chris.
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Old 04 June 2003, 11:33   #2
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Where the pipe is attached to the primer the tank or the fuel separator It could have rucked up inside. Ie the rubber is part covering the pipe inside. This would be intermittent and would only effect fuel flow at high revs when the whole pipe is needed.

That is right isnít it h2o Happened on the 7.4
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Old 04 June 2003, 11:36   #3
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I suppose.

I`ll try cutting the hoses back an inch or so on all the connectors
Its either that, the bulb or the tank - agreed?

Chris

PS Why aint you working??
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Old 04 June 2003, 11:38   #4
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I am in a meeting on, on the phone to the US and the East. Not concentrating prop though. Will be in work at 1am tomor though

Why are you not working
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Old 04 June 2003, 11:43   #5
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Old 04 June 2003, 11:48   #6
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Are you amking you low life workers make you tea.
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Old 10 June 2003, 08:00   #7
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OMC fuel flow problems

Tried cutting the pipe back and checked all the one way flow valves. All seem to be working and I did find a section where the inner pipe had collapsed from the outer rubber tube. Will give it a try next weekend.
I`m pondering replacing the diesel/water seperator anybody know of some good brands?
Barnet Marine fit a rarther swanky number to their tornados but its £50+

Dave, Still up for the Contender worlds? I`ve emailed you the dates.

Chris
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Old 10 June 2003, 09:09   #8
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Engine cut out

I've got an old Johnson VRO, and twice recently whilst charging along at WOT in pretty flat water, it has died completely.

Restarted immediately on turning the key and has carried on running perfectly.

Could this be a problem with the bulb/ fuel line?

I've actually got a brand new one still in packet, so I could put it on if you think that would cure it?

Thanks
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Old 10 June 2003, 09:38   #9
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There are a number of things it could be but at least you have tested the engine with another tank so you know it's nothing that end.

Has the fuel system been running ok or has it been changed.

It could be a seal gone in the filter making it draw in air, which side of the filter is the primer bulb, in or out.
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Old 10 June 2003, 10:07   #10
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Re: Engine cut out

Quote:
Originally posted by whitingiom
I've got an old Johnson VRO,
I used to have a 150 GT VRO and the fuel flow problem was that it burned around 15gph at WOT!!
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