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Need Help. DF300 Fuel Delivery issue?

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Need Help. DF300 Fuel Delivery issue?

Old 07-19-2016, 02:34 PM
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Default Need Help. DF300 Fuel Delivery issue?

This is a 2007 Suzuki DF300. I had an issue late last year with what I thought was the water separator on my boat. It died on me while we were out and would not restart. I anchored up, called for a tow and while I was waiting, I decided to see if I could figure it out. I bypassed the fuel/water separator, pumped the fuel bulb a few times and, bingo, it was back in business. Cancelled the tow and went home.

Replaced the separator and its housing with a brand new Yamaha separator assembly. Has worked great until this past weekend. Just got on plane and it dies on me. Tried to restart and it would not start. Went back and pumped the primer bulb and it feels like it is pumping air, but it always feels like that. The primer bulb is about two years old. Tried to restart again and nothing. Kept pumping the primer bulb and low and behold, it picks up and pumps fuel to the engine. Started right up and ran home with no additional issues.

Where should I start with this? Is it the primer bulb? Fuel separator again? Fuel line? Fuel pump??? The motor runs great, but it seems to be a fuel delivery issue and not an engine issue to me.

Thanks in advance for any help you guys can provide.
Old 07-19-2016, 03:29 PM
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I would start at the Gas tank:

1) Vent: Make sure it is not obstructed cause a vacuum issue.
2) Fuel pick-up / Anti-siphon tube: make sure it is working correctly.
3) Fuel Lines from the tank to the separator: make sure it good condition and not collapsing.
4) Prime Ball: make sure it good condition and not collapsing.
5) Fuel Lines from the separator to the motors: make sure it good condition and not collapsing.
6) Engine fuel separator: make sure it good condition, replace filter and make sure it is properly seated and tighten.
Old 08-31-2019, 07:48 PM
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fuel cooler clogged up?

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