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| Air bubbles in fuel line causing rough firing and rpm drops https://www.smwebhead.com/phpBB3/viewtopic.php?f=2&t=7717 |
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| Author: | Hobie [ Sat Jun 11, 2011 11:56 am ] |
| Post subject: | Air bubbles in fuel line causing rough firing and rpm drops |
4.3L V6 OMC 1988 Horizon in storage since 97, I picked up late last summer. Looking at it today, running with muffs on in the driveway. I notice rough firing and 3-500 rpm drops. This also plagued us on the few times that we were out late last year. I noticed air bubbles in the clear fuel line going to the carb. Normal? |
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| Author: | ric [ Sat Jun 11, 2011 12:31 pm ] |
| Post subject: | Re: Air bubbles in fuel line causing rough firing and rpm drops |
Nope. You're ingesting air. I'd check the fuel tank and it's pickup for cracks etc. Also check for fuel leaks. Maybe the fuel pump diaphragm is toast. |
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| Author: | LouC [ Sat Jun 11, 2011 1:18 pm ] |
| Post subject: | Re: Air bubbles in fuel line causing rough firing and rpm drops |
NOT normal, and a sign of a leaking fuel pump diaphragm, this means you need to replace the fuel pump, it's a safety thing on inboards and I/Os so the fuel does not leak in the engine compartment but gets sucked in through this clear line. There should never be gas or bubbles in that line. And if you didn't last year, get the gas tank cleaned out, get rid of the old gas and if it doesn't already have one, get a water separating fuel filter. I'd take a close look at all the fuel lines, you can lift up the cover over the gas tank to get a good look at em... Finally, you may have to get the carb rebuilt if it hasn't been in all those years. The OMC 4.3 is a good running package when set up right but clean gas and a good fuel system check up is in order.... |
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