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Old 25 June 2014, 15:21   #1
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Country: Denmark
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Merc 115 EFI Primer Bulb ?

Hi

I am about to install a brand new 115 EFI. The boat is with a built in tank. Is it wright understood that no primer bulb should be mounted?

Cheers Thomas
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Old 25 June 2014, 16:25   #2
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Still need a primer bulb as far as I know. I doubt the fuel pump in the motor would draw air until fuel reached it.

jky
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Old 25 June 2014, 16:47   #3
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Still need primer
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Old 25 June 2014, 17:19   #4
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I had a newish 115 EFI that didn't have a primer bulb, spoke to Mark at MB and he said they are useless on them because of the way the fuel pumps work.
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Old 26 June 2014, 06:11   #5
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When I see installation guide it tells that it is no good to have a primer. I am a little confused and thinking how the internal pump can drag all the way from the build in tank with air in the pipes
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Old 26 June 2014, 10:49   #6
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there is no primer bulb fitted, if there is it will cause more problems than enough.Contact turbo he will tell you the same, and when you have installed the obm, dont forget it should be checked for fuel integraty, the factory used to say a vacumn test, i plumbed in a pipe of clear plastic and made sure there were no air bubbles.If there are air bubbles it will run weak and again will/can cause problems.
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Old 26 June 2014, 11:28   #7
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Clear plastic fuel hose? That's a new one for me. Is it actually rated for fuel? We have nothing like that over here that I've ever seen.
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Old 26 June 2014, 11:47   #8
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So no prmier bulb in any EFI ?

Ive got two EFI engines both with prmier bulbs .... both running off portable tanks
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Old 26 June 2014, 13:58   #9
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Interesting
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Old 26 June 2014, 14:34   #10
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captnjack, I retired three years ago , but before that all boats that were rigged with new OBMs , were supposed to have a vacumn gauge plumbed into the fuel system to make sure there were no blockages in the fuel system from the fuel tank to the OBM. As taking a vacumn gauge out each time was a bind, I found that a piece of clear plastic pipe, plumbed in by the btm tray(to get it as close to the fuel pump/s as possible)you can see if there are any air bubbles in the fuel going through to the pump, no air no problems, There was a service bulletin issued in the U.K. a few years ago about it.Obveusly the gauge /clear plastic pipe were removed before delivery to the customer. Yes I did find fuel problems in the fuel lines on some boats so I do know from my personal experiance that the clear pipe works.
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