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Old 04 January 2016, 06:29   #1
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Fuel Primer Bulb

One of my jobs this winter was to try and tidy up the cables at the rear of the boat, managed it with some success.

The most difficult bit was trying to make the fuel pipe with the primer bulb in it look tidy. It then occurred to me that I might not need the bulb, as I have never used it? I have an inboard, fuel tank which is permanently connected to the engine.

I can understand the need with detachable tanks but are they really needed on a modern, large HP installation?

What are your thoughts?

Andy
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Old 04 January 2016, 06:36   #2
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Yes you need one, not least because they act as a one way valve to stop the fuel in the line draining back to the tank, in which case you'd need an err primer bulb. What happens if you run out of fuel (it happens apparently&#128527 & need to prime the system. Mine's under the console out of the way.
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Old 04 January 2016, 06:44   #3
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Yes you need one, not least because they act as a one way valve to stop the fuel in the line draining back to the tank, in which case you'd need an err primer bulb. What happens if you run out of fuel (it happens apparently��) & need to prime the system. Mine's under the console out of the way.
Thanks Dave

Rather embarrassingly I did run out of fuel last year (don't ask!!). Refilled the tank and cranked it over on the key and it sorted its self out. I like the idea of having it inside the console but it would leave the bulb the wrong side of the filter for me. Is there such a thing as a small in line, non return valve?

Thanks
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Old 04 January 2016, 06:48   #4
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Doesn't matter which side of the filter it is. I prefer it before the filter close to the tank.
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Old 04 January 2016, 07:34   #5
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Fuel Primer Bulb

Quote:
Originally Posted by Pikey Dave View Post
Doesn't matter which side of the filter it is. I prefer it before the filter close to the tank.
I have rigged mine the same although the installation destructions for the water separator say the bulb MUST be the engine side of the filter. It's never caused an issue, I used the primer bulb when I first fitted the engine and I've never used it again.

That reminds me, I need to replace the bulb due to the rubber going all soft and waffy, I thought it was a decent one when I bought it but its obviously made of poor quality rubber.
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Old 04 January 2016, 07:38   #6
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Doesn't matter which side of the filter it is. I prefer it before the filter close to the tank.
+1.....that way it can be used to prime the filter when you change it. They "blow" much better than they "suck".

Wouldn't advise running out of fuel. If the engine is going hard when that happens there is a risk of it "leaning" out before it actually stops and could potentially do some serious damage.
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Old 04 January 2016, 07:39   #7
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Eliminate the primer bulb.

Parker-Racor has a filter base with an integrated primer bulb in the body of it.
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Old 04 January 2016, 08:02   #8
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Eliminate the primer bulb.

Parker-Racor has a filter base with an integrated primer bulb in the body of it.
That sounds interesting, do you have any more details?
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Old 04 January 2016, 08:33   #9
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That sounds interesting, do you have any more details?
Racor Spin-On Fuel Filter / Water Separator Assembly - Clear Bowl

Racor 490R-RAC-01

I use one with the 2 micron element and a vac gauge.

I use 0% ethanol fuel and still have to spill off about 50-100 ml of water every 15 hours or so!
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Old 04 January 2016, 10:10   #10
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Quote:
Originally Posted by office888 View Post
Racor Spin-On Fuel Filter / Water Separator Assembly - Clear Bowl

Racor 490R-RAC-01

I use one with the 2 micron element and a vac gauge.

I use 0% ethanol fuel and still have to spill off about 50-100 ml of water every 15 hours or so!
Thanks, not seen one of those before looks interesting and far better than a separate bulb. Looks like I will be changing my filter/separator next year.

Andy
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