Why Priming Bulbs Get Sucked Flat - Tips to Diagnose and Fix

In this video we walk through the main reasons priming bulbs get sucked flat causing your outboard to die.
Motor: 6HP Mercury 4 Stroke
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[@dustinj7650]

Got another one for you, the fuel connector going into the motor. A bad seal between the fuel line female end and the outboard male can cause fuel to leak from the connection, air to be sucked in, and the bulb to be squishy. This is happening to me on a brand new (after market) fuel hose/connector...apparently the o-ring seal is a weak point. Ever happen to you? Do you get a 'click' when attaching your fuel line to the motor intake? I don't get a click, and my fuel connector just looks like it is 'hanging off' or pulling away from the attachment. Luckily I have the internal tank that has saved me in this situation...

[@Skinnyriver]

That’s a really good point, it’s happened to me but just because I didn’t fully seat the connector. Yeah if there is no click then that little retaining clip/leaver is holding the connector in and you get air or a leak. Good point

[@dustinj7650]

​@@Skinnyriverthanks! made a short 45 second video to show the issue to my outboard provider. You can see how my connector wants to 'pull away'. But then I was able to get it 'clicked' into place by pushing and wiggling the line. 1st time! lol kzbin.infoinH0zxulJT4?si=7Q4nj_NPv-XI1gOA

[@NinoSpinner]

Ciao, ho un Mercury 3.5 portato a 5 cv con elica in alluminio e carburatore, ora vorrei mettergli un serbatoio esterno, ma non avendo la pompa benzina può funzionare? Alcuni su KZbin dicono di si, ma video OnBoard non ne ho mai visti

[@Skinnyriver]

Si su motor no tiene una bomba de combustible, no creo que funcione a menos que el tanque de gasolina esté más alto que el carburador. ¿El motor tiene un tanque de combustible externo conectado?

[@NinoSpinner]

@@Skinnyriver no I would like to do it, it's a Mercury 3.5

[@boatsandoutboards9070]

​@NinoSpinner Some people modify fuel cap of the internal tank, and Connect it to the external tank's fuel hose. However, you still need to pump the fuel with the priming bulb in order to fill the internal tank.

[@boatsandoutboards9070]

​@@NinoSpinner it is called - extended run fuel cap

[@NinoSpinner]

@@Skinnyriver no, ma vorrei farlo perché è un 3.5 portato a 5 cv e consuma circa 2 litri l'ora a tutta manetta