Author Topic: fuel pump symtoms (Read 4488 times)

Anonymous · « **Reply #15 on:** July 25, 2006, 01:38:00 PM »

OK, when you pumped the bulb you became the fuel pump. I'd say you got it nailed!

Just for kicks, check the pulse line real close. If it's not tight or is cracked / broken that means a weak operating pulse. Or if the pulse limiter is plugged. That will do the same thing.

jdupree · « **Reply #16 on:** July 25, 2006, 02:27:24 PM »

Is the pulse limiter on the VRO/fuel pump? I don't know alot about these VRO pumps. Should I remove the VRO pump and take it apart to see what I have? Thanks,

Anonymous · « **Reply #17 on:** July 25, 2006, 02:42:02 PM »

The pulse limiter is actually more of a flame arrestor than anything. There should be a round fitting screwed into the block or in-line in the pulse line. The fuel / oil pump works on crancase pressure and vacuume or "pulses". However, there can be fire in the crankcase and if there is no flame arrestor the pump diaphram can be damaged. If the fitting is clogged, the hose loose or the diaphram bad the pump will not work as designed. That usually results in a "weak" pump that cannot supply enough fuel to run the motor properly.

Now, depending on which pump you actually have (VRO, VRO II, OMS etc) you may be able to get parts for it. If you aren't sure which pump you have, I'd suggest looking into a new pump. In many cases a new pump is supplied as a part of the rebuild. Personally I like the idea of the oil injection. As long as it's maintained the newer systems work well.

jdupree · « **Reply #18 on:** July 25, 2006, 03:14:33 PM »

If I am not mistaken, that hose plugs in to the first fitting on the vro pump at the front of the pump? I know the middle plug in is for the gas in and then the oil line plugs into the rear? If that is the case I will check it out. I noticed that hose when I had the carbs off. I assume that is supposed to be an air tight fit? I noticed that fitting was in the block and the hose would rotate freely on that fitting

Anonymous · « **Reply #19 on:** July 25, 2006, 03:24:44 PM »

AH! You're getting warmer. Lets hope its just sucking air and losing the pulse.

I believe you are correct on the hose locations.

jdupree · « **Reply #20 on:** July 25, 2006, 04:17:20 PM »

Dhadley,

Thanks again for the help. You hve taught me a couple of things today. I will let you know what I find.

RickK · « **Reply #21 on:** July 26, 2006, 05:48:04 AM »

Geez, even I learned a few things that probably pertain to my 115 and I wasn't even trying 8)
Thanks Dhadley

Author Topic: fuel pump symtoms (Read 4488 times)

Anonymous

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jdupree

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Anonymous

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jdupree

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Anonymous

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jdupree

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RickK

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