Fuel Pick up tube problem

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kjoverbeck
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Re: Fuel Pick up tube problem

Post by kjoverbeck » Wed Dec 13, 2017 8:42 am

That all makes sense except that when I topped off both tanks at Green Turtle it only took 72 gallons.

kjoverbeck
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Re: Fuel Pick up tube problem

Post by kjoverbeck » Wed Dec 13, 2017 1:56 pm

Thanks for all the replies. This issue got me promoted to 1st Mate!!

lgeller
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Re: Fuel Pick up tube problem

Post by lgeller » Wed Jan 17, 2018 12:27 pm

Problems with the pick up tubes were the first indication of the trouble that we had on PLUSH TOY. It was after seeing the tubes that we tested the fuel and determined that we had received some diesel mixed with gasoline.

With regard to cleaning the tanks, I used LUK FUEL here in Florida. They did a very thorough job emptying and scrubbing the tanks.

Nick
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Re: Fuel Pick up tube problem

Post by Nick » Mon Dec 02, 2019 8:52 am

Well, well, this thread was an interesting find! We bought Rising Tide (now Catsaway) from Kent earlier this year. She’s been running great until a particularly rough passage across St Andrews sound two days ago. Soon thereafter the starboard motor struggled to get above 3,000rpms. I changed both the primary and secondary filters (the Racor filter element looked like a slightly twisted can), but had no improvement. I then swam under the boat hoping to see something wrapped around the prop, but nothing. After talking to a mechanic (and reading this thread!), I now believe the issue is probably something between the fuel tank and the Racor since the port side motor continues to operate happily.

Again, thank you to all those that came before and continue to post on this invaluable forum. More to come!
Nick & Barb
Catsaway
2005 PDQ34 #66

duetto
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Re: Fuel Pick up tube problem

Post by duetto » Mon Dec 02, 2019 1:39 pm

hi,

could the deformed racor be from too much vacuum. in an earlier post mentioned vacuum gauges. do they read normal?
john & diane cummings
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Nick
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Re: Fuel Pick up tube problem

Post by Nick » Tue Dec 03, 2019 3:03 pm

Yes, good point, vacuum reads high. I think it’s all driven by restricted fuel flow. I suspect the issue may be as easy to resolve as disconnecting the fuel line at the fuel tank, hooking up my dinghy pump to the fuel tank pick up and pumping some air down the tube and into the tank to clear the pick up. That’s my next step anyway! Cross fingers it’ll be THAT easy!
Nick & Barb
Catsaway
2005 PDQ34 #66

duetto
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Re: Fuel Pick up tube problem

Post by duetto » Tue Dec 03, 2019 8:11 pm

i would also check the inlet to the racor. i read about a clog at the inlet. i think there is a ball shutoff of some sort. good luck and report back.
john & diane cummings
duetto mv34 #23

Nick
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Re: Fuel Pick up tube problem

Post by Nick » Thu Dec 05, 2019 4:27 pm

After checking the fuel system from tank pick up through filters to motor, cleaning the turbo compressor and cleaning and testing all the injectors (they were dirty), the problem is not resolved. Next step is to rebuild the fuel injection pump. As an aside, I called a Yanmar dealer and was told there are NO new injection pumps in the US and only seven on the shelf in Japan for my motor. Fortunately, the boat still runs so we’re heading further south to leave her with a known mechanic and free dockage while we fly home for the holidays. At least we’re still boatin’.....and I’ll have a great Xmas present for Barb..... a shiny new rebuilt fuel injection pump haha! Will update results when complete.
Nick & Barb
Catsaway
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Cat Daddy
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Re: Fuel Pick up tube problem

Post by Cat Daddy » Fri Dec 06, 2019 11:34 pm

Nick,
Mine had a restriction in the elbow that screws into the tank, the screen that has been mentioned earlier is in the elbow on my boat. I don't know if it was always inside the elbow or migrated up the tube over the years, but that is where it is. During a long crossing from Clearwater to Destin the vacuum built to a unbelievable level and the engine kept running. After daybreak I changed filters but the high vacuum returned quickly. Having vacuum gauges at the lower helm greatly helped troubleshooting the problem. With a light shining up the pick up tube I could see the gunk lodged in the elbow. Back flush with brake parts cleaner and problem solved.

Your problem sure sounds similar and because it was after a crossing I think you have a restriction ahead of the Racor. The deformed filter is another indicator.

If you are going to be at the rendezvous I would like to meet and discuss.

Good Luck,
Rafe
Rafe Williams
"Cat Daddy"
MV34 #32

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