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Old 01 December 2014, 12:58   #1
Country: UK - Wales
Town: Bangor, North Wales
Make: Tornado
Length: 5m +
Engine: Evinrude 70hp OB
Join Date: Nov 2001
Posts: 93
Testing the fuel pump - old Evinrude 70

Can I prove the fuel pump by bypassing it and having a passenger pump the primer bulb like mad? I don't really want to spend on all the bits to rebuild the carbs without a bit more evidence that it is really them. I tried having a passenger pump the bulb while the fuel pump was inline without any success.

All the best


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Old 01 December 2014, 15:26   #2
Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
Join Date: Jul 2009
Posts: 2,447
It might help but I'd connect the in & out of the pump together as the usual fault is a hole in the diaphragm which allows excess fuel to be sucked into the cylinder that the pump takes its pulses off. Pumping the primer in this instance would probably make things worse
If you just leave the pump ends open you could possibly suck air & create a different fault .I'd link a short hose from inlet to outlet then try the hand pump method
Usually you can get away without buying any parts to rebuild the carbs if your care full with the gaskets etc you can usually reuse the old ones
Usual problem is just muck or solidified fuel in the jets.a damn good clean usually sorts them without any new parts

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Old 01 December 2014, 16:22   #3
Peter_C's Avatar
Country: USA
Boat name: Uh...a kayak?
Length: 4m +
Join Date: Dec 2009
Posts: 1,494
What is the motor doing?

As a note the carbs have enough fuel in them to keep it running for a little while even if the fuel line is disconnected. With the motor off and pumping the fuel bulb, do it get hard? How does the motor start after doing so?

Depending on age of the motor, it might be a good idea to replace the fuel pump as they do fail. Inspection of the diaphragm is pretty easy.

I would strongly recommend a water separating fuel filter if you don't already have one.
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