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Old 06-29-2017, 10:57 PM   #1 (permalink)
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Exclamation 1993 F6A Carb losing power after 10mins on highway

Hi all.

My 1993 Suzuki Alto F6A SOHC wagon has developed an issue where it'll splutter and cut out temporarily (requiring me to pull over to a complete stop or coast slowly) after around 10 minutes of highway driving (80-100km/h) . I can leave it running for a 30 or so seconds, then can continue on my way for a few minutes before the same happens again.

This feels like fuel starvation as more throttle doesn't have any effect when the engine starts spluttering/dying. I can test the fuel pump's pressure at the carb but I'm unsure as to what pressure to expect (due to not having a service manual.). Does anyone know the expected pressure? If not can you test your Alto?

I have replaced the leads, spark plugs and main fuel filter. This made the engine run great, but the issue persists.

Any other ideas as to a cause for this? I had an old Honda City do the same which was caused by timing as it was pinging hard. That doesn't make sense here as nothing mechanical has changed since this developed and the F6A isn't pinging.

Thanks,
Mugen
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Old 07-07-2017, 04:53 PM   #2 (permalink)
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After testing the fuel pump today it's showing 1.8 PSI at the carb. That seems awfully low? What do other Suzuki carbs run?
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Old 07-07-2017, 05:17 PM   #3 (permalink)
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Most carbs need 10-15psi, Check the fuel filter, and power and ground before going to pump.

That of course if you have an electric.

... Philip
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Old 07-07-2017, 07:08 PM   #4 (permalink)
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Quote:
Originally Posted by aquanaut20 View Post
Most carbs need 10-15psi, Check the fuel filter, and power and ground before going to pump.

That of course if you have an electric.

... Philip
Fuel pressure pre the (new) fuel filter is 2psi. Its an in-tank pump i presume as I can't see anything outside. I'll drop the tank now and see how much power its getting. Perhaps an in-tank filter is clogged if it has one.
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Old 07-07-2017, 10:48 PM   #5 (permalink)
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I was getting a solid 12V at the pump so I dropped the tank and took the pump out. Sounds like its full of grit, so it might be time for a new one. I'll try my luck at cleaning it out first.
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Old 07-13-2017, 06:08 PM   #6 (permalink)
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Fixed!

I purchased another pump from another Alto and was surprised it still only pushed 2.0PSI at the pump. I swapped them anyway and it fixed it! Looks like either my pump gave up after a while or couldn't manage enough flow.

Either way: The pump caused my highway power-loss!
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