Originally Posted by captnjack
So I replaced the primer bulb. Even with a brand new bulb, priming didn't happen. I suspect this may be because there's no place for the air to go in a fel injected engine. I.e. the bulb can't push air past the fuel pump/injectors and there's no carburator to vent it off.
Question is, what did you replace the bulb with? OEM? Or Tempo?
I had a Tempo primer bulb that new, out of the package, wouldn't pump air (much less fuel.) The bulb would compress, but would not re-expand. Add to that that every fitting had to be modified to work, and, well, never again.
Anyone else had this issue? Is this an issue for all fuel injected motors? Do you just keep cranking it to prime the fuel line with its own fuel pump? I'm puzzled.
I remember this being an issue with early FI cars, but I haven't heard of the problem recently.
Considering engines are shipped dry, and fueled once installed, I can't see this being a routine problem.
You've actually got 2 fuel pumps in your engine: a low pressure pump (the one that draws fuel from the tank to the engine), and a high pressure pump (that supplies the injectors with pressurized fuel.) So, the question is, which one isn't working? Perhaps you could start disonnecting things and see where you're losing pressure?
I'd think that there has to be some sort of vapor separator somewhere, else the motor would never be able to get raw fuel. But, I have no idea where it would be.
You can poke around on the Yamaha website and see if you can figure it out from the parts list. Go to www.yamaha-motor.com
, select Marine, select Parts and Service, and there's a link for the parts list there. The owners manuals are also available on-line.
I looked, but was unable to find anything of use for your problem. You might have better luck than I did.