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ANATOMY of a fuel bulb...

Old 06-20-2005, 09:20 PM
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Default ANATOMY of a fuel bulb...

There has been many recent discussion on Fuel/Oil bulbs. It seems to be one of the largest topics of discussion at any given time. Which is better OEM...or is Tempo junk? Clearly there is a difference in manufacture.

I just happened to have two laying around! The following pictures are of two different bulbs; Tempo and OEM (Evinrude/Johnson). The top one is Tempo (red inlet) and the bottom being OEM (Original Equipment Manufacture). The inlets are both on the right with the 'arrow' pointing to the left. All parts are lined up as disassembled. I had to saw the Tempo inlets/outlets apart...they were glued together. The OEM bulb could easily be disassembled, cleaned ad reassembled if necessary.

The OEM valve uses a hard rubber balls and a heavy springs on both sides (inlet/outlet). The Tempo valve uses a plastic cup and a much lighter spring on one side only (inlet). When I blew into the valve the OEM seal (rubber ball) was noticely better...no leakage at all. Now, just for a minute, visualize squeezing the bulb...can you see the valves open and closing? Can you see why it 'might' be better to have the 'arrow up' when squeezing? Now you have pressureized the fuel system. Once fuel is flowing, the bulb is no longer hard or needed. The OEM is much thicker rubber too...probably why the rubber tends to get HARD when old. Check your oil tank bulb sometime!

I hope these PIC's lend a little clarity/controversy to the subject!













My vote would be for the OEM bulb; hands down!
Old 06-20-2005, 09:49 PM
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Default Re: ANATOMY of a fuel bulb...

Very nice evaluation. This link will also give you a great overview how they operate.



http://continuouswave.com/whaler/reference/primer.html

Nice work Mumbler
Old 06-20-2005, 10:12 PM
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Default Re: ANATOMY of a fuel bulb...

Good post
Old 06-20-2005, 10:37 PM
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Default Re: ANATOMY of a fuel bulb...

nice post, mine will be replaced in the next couple of days, and needless to say, the pics just made picked out which one will be on my boat (oem).
Old 06-20-2005, 10:46 PM
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Default Re: ANATOMY of a fuel bulb...

Thanks....will replace my two Tempo's ASAP. Nice post!
MDT
Old 06-21-2005, 12:54 AM
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Default RE: ANATOMY of a fuel bulb...

Great post and BW23 great link
Old 06-21-2005, 02:23 AM
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Default Re: ANATOMY of a fuel bulb...

Excellent thread. Tempo suck and you just confirmed it!
Old 06-21-2005, 07:27 AM
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Default Re: ANATOMY of a fuel bulb...

Great Post! Now I know why the Tempos never lasted.....
Old 06-21-2005, 07:43 AM
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Default Re: ANATOMY of a fuel bulb...

Sometimes you do get what you pay for. Good post. I never saw a comparison like that before.
Old 06-21-2005, 03:02 PM
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Default Re: ANATOMY of a fuel bulb...

I can tell you that Yamaha makes a superior fuel bulb. They make them in two sizes---5/16 for 90 hp or smaler---3/8 for 115 and up. They have an arrow on the side of the bulb.The arrow should point to the engine. If you hold the bulb with the arrow pointing up while pumping the bulb there is a check valve that will help keep air out of the engine. All you do is pump the bulb is tight.
Old 06-21-2005, 08:12 PM
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Default Re: ANATOMY of a fuel bulb...

Probably one of the least complicated thing we have on the boat...maybe the most misunderstood too. ;? Not a lot of excitement in a bulb!
Old 06-23-2005, 07:40 AM
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Default RE: ANATOMY of a fuel bulb...

Bump!

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