TurfLife Posted July 31, 2018 Report Share Posted July 31, 2018 I own a 2006 20ft pathfinder with a f115 Yamaha. Recently been having issues of the motor starving for fuel when running at high rpms. The bulb is completely sucked flat when the engine is on. I recently completely disconnected the fuel vent under the gas cap and completely cleaned that. Even if I open the gas cap while running, the bulb will still be collapsed. So that rules out a venting issue there. I did some work today and saw my fuel sending unit and anti siphon valve was super corroded. I ended up breaking off the barb end of the anti siphon unit when I tried to remove the hose. Anyone ever have any issues unthreading the fuel sending unit elbow? I couldn’t get it to budge today so I sprayed with the pb blaster and will try again tomorrow. Anyone ever have to replace this elbow and know where to get a new one? Link to comment Share on other sites More sharing options...
Wanaflatsfish Posted August 1, 2018 Report Share Posted August 1, 2018 4 hours ago, TurfLife said: Anyone ever have any issues unthreading the fuel sending unit elbow? the antisiphion valve is the where you broke off the barb....do not try and rip off the elbow...just grab the valve's end and turn left. DC Link to comment Share on other sites More sharing options...
TurfLife Posted August 1, 2018 Author Report Share Posted August 1, 2018 Can you not remove the elbow? Was gonna try and get it off to see if there was something stuck in the pickup tube? Link to comment Share on other sites More sharing options...
justfish Posted August 1, 2018 Report Share Posted August 1, 2018 Yes the elbow is the top of your pickup tube. You can put a box wrench on the elbow and unscrew it and pull whole tube out and Check screen on bottom Link to comment Share on other sites More sharing options...
smilemaker Posted August 1, 2018 Report Share Posted August 1, 2018 When you unscrew the elbow you need to put a wrench on the nut below it to stop it from turning. It looks like a poly tank and I believe that but holds the seal to the tank Be patient plenty of pb blaster. Better to take several days trying a little at a time. If you break things here the fix is complicated Link to comment Share on other sites More sharing options...
Wanaflatsfish Posted August 1, 2018 Report Share Posted August 1, 2018 2 hours ago, smilemaker said: If you break things here the fix is complicated that's why it's easier to just remove the anti siphon. dc Link to comment Share on other sites More sharing options...
jason p Posted August 1, 2018 Report Share Posted August 1, 2018 40 minutes ago, Wanaflatsfish said: that's why it's easier to just remove the anti siphon. dc ... and replace it with a regular 3/8" barb fitting. That's what I've heard anyway. Link to comment Share on other sites More sharing options...
TurfLife Posted August 1, 2018 Author Report Share Posted August 1, 2018 Thanks for the help guys, thinking im just gonna replace it with a regular 3/8" barb valve... Primer bulb is an anti siphon valve already... Link to comment Share on other sites More sharing options...
Wanaflatsfish Posted August 1, 2018 Report Share Posted August 1, 2018 13 minutes ago, TurfLife said: Thanks for the help guys, thinking im just gonna replace it with a regular 3/8" barb valve yes,this is what I did.. dc Link to comment Share on other sites More sharing options...
justfish Posted August 1, 2018 Report Share Posted August 1, 2018 4 hours ago, Wanaflatsfish said: that's why it's easier to just remove the anti siphon. dc Done this twice now and both times the anti siphon was corroded real good to the elbow and wouldn’t budge, yet the elbow unscrewed from tank with ease. Broke one off at threads once I had it out in fact ... Since others have had different outcomes, I’d go in with an open mind try both ways and see what you got. It prob just comes down to if the guy rigging the tank that day ate his wheaties or not. Link to comment Share on other sites More sharing options...
SCFD rtrd. Posted August 1, 2018 Report Share Posted August 1, 2018 The anti siphon valve serves two purposes. (1) It keeps fuel in the fuel lines from draining from the motor back to the tank when the motor is off. If you remove the anti siphon valve, you'll have to pump the bulb quite a bit before starting. (2) the anti siphon valve has a small spring and ball that seats against an o-ring. Pumping the bulb or operating the fuel pump can easily overcome the pressure of the spring to supply fuel to the motor. If you have a fuel line failure under the deck, the anti siphon valve keeps fuel from siphoning from the tank and filling your bilge with gasoline. So, the anti siphon valve is a factory installed safety device. Yep, you can operate without it, but is it worth the risk? Link to comment Share on other sites More sharing options...
TurfLife Posted August 2, 2018 Author Report Share Posted August 2, 2018 tried again yesterday... still not budging... Tried turning the elbow and the antisiphon, nothing would move... Soaked it again in pb blaster, will try again today Link to comment Share on other sites More sharing options...
justfish Posted August 2, 2018 Report Share Posted August 2, 2018 *** it, he ate his wheaties I had same issue as you are describing and ended up having a small black flake of something on my pickup screen. Was no more than 1/3 of size of screen so was surprised it caused that much issue but removing it fixed it right up. Link to comment Share on other sites More sharing options...
captpn Posted August 2, 2018 Report Share Posted August 2, 2018 Try both tightening and loosening... back and forth...usually helps get it going Link to comment Share on other sites More sharing options...
TurfLife Posted August 3, 2018 Author Report Share Posted August 3, 2018 On 8/2/2018 at 10:36 AM, justfish said: *** it, he ate his wheaties I had same issue as you are describing and ended up having a small black flake of something on my pickup screen. Was no more than 1/3 of size of screen so was surprised it caused that much issue but removing it fixed it right up. Once you got the elbow off did the filter and tube slide right out that hole? Mine seems to be catching I can’t pull it out Link to comment Share on other sites More sharing options...
Wanaflatsfish Posted August 4, 2018 Report Share Posted August 4, 2018 18 hours ago, TurfLife said: Once you got the elbow off did the filter and tube slide right out that hole? Mine seems to be catching I can’t pull it out most likely has a filter on it.... You don't need to remove it...to do so, most likely you will need to remove connection to the tank... What happened to the elbow...it looks like it sheared off? dc Link to comment Share on other sites More sharing options...
justfish Posted August 4, 2018 Report Share Posted August 4, 2018 It came unscrewed right and didn’t break? It kinda looks like the threads I circled are still in, but ( atleast in this one) doesn’t seem like you’d be able to get to pick up tube Mine came right out. I had a filter screen like pictured, so maybe you just need to wiggle it through Link to comment Share on other sites More sharing options...
TurfLife Posted August 4, 2018 Author Report Share Posted August 4, 2018 Update, after many curse words, lots of fiberglass in my arm and a sore shoulder I have fixed the problem Link to comment Share on other sites More sharing options...
Dale Nelson Posted August 5, 2018 Report Share Posted August 5, 2018 What was the fix? Link to comment Share on other sites More sharing options...
TurfLife Posted August 5, 2018 Author Report Share Posted August 5, 2018 7 hours ago, Dale Nelson said: What was the fix? New pick-up elbow and replaced the antisiphon with a regualr 3/8th hose barb Link to comment Share on other sites More sharing options...
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