Plastic filters on a pressurized fuel line - K-Bikes.com - Excellence in Motion
 
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post #1 of 3 (permalink) Old Sep 15th, 2009, 9:22 pm Thread Starter
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Plastic filters on a pressurized fuel line

On my K75, the factory fuel filter fits inside the fuel tank. Wanting more capacity and less hassle when it comes to replacing it, about a year ago I scrapped the old one and installed a new filter outside of the tank.

For a while, I used a metal in-line filter.

Today I went to the auto parts store and they didn't have any metal ones that were small enough for what I needed. So I bought a plastic filter.

But, the line I'm installing it on is AFTER the fuel pump. We're talking high pressure. Just looking at it, the plastic filter doesn't look up to the task. Its stressed by the pressure and looks like it (could) burst.

Is it safe or should I trust my gut?
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post #2 of 3 (permalink) Old Sep 15th, 2009, 9:36 pm Thread Starter
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I've found my own answer:

http://www.ibmwr.org/r-tech/oilheads...l_filter.shtml

"DON'T use the Fram G2 nylon-encased equivalent. The high 42 psi fuel pressure could burst a non-metallic fuel filter case!"
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post #3 of 3 (permalink) Old Sep 16th, 2009, 3:22 am
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This is not mentioned in the article, but I think the reason they fit any kind of fuel filter inside the tank is for safety:

That 42 psi you mentioned is more like 52 psi and that's with a clear filter. But many riders have had issues with particles or sludge in their gas. If any fuel filter plastic or metal, starts to get clogged then there's nothing stopping the fuel filter bursting, since the fuel pump can deliver over 100psi. You may find that plastic body filters are fitted to pumps with over pressure shuttoffs, there is a bypass valve inside, or they just don't bother under the hood of a car.

I've read a couple of posts where even the oem ali can fuel filter has split. I tested a new replacement and it went to 100psi suggesting the one's that split went way over that.

Take care, a burst fuel filter under the right side plastics can't be too pleasant. The best engineered solution for an exterior filter would have been a strong sealed metal housing which could be unscrewed to fit (cheaper) cartridge filters.



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