1981 Johnson 15 hp fuel problem

[boardhead2009]

"I have a fuel starvation prob

"I have a fuel starvation problem. I can prime the carburetor by squeezing the bulb and the engine will crank right up. After a few minutes it runs out of fuel. I installed a clear fuel line between the fuel pump and the carburetor in order to monitor the fuel flow. I'm seeing very little flow and a lot of air bubbles. I started at the tank and verified that the screen was clean and there was no trash. The fitting at the tank is slightly loose. But, every OMC tank fitting that I've seen has been a loose fit. Could air be introduced at this point and no fuel is being picked up? The squeeze bulb is an after-market item; the hose and fittings are original. Priming the carburetor with the squeeze bulb doesn't create any leaks in the fuel system. I disassembled the fuel pump and didn't see any visable tears in the neoprene diaphragms. This unit seems to work off of impulses received from the intake tract? I also went through the carburetor just to remove that variable. With the engine running, I held the tank fitting tight against the tank, hoping to eliminate any introduction of air. That didn't help. So, any suggestions as to my next step is appreciated."

 

[joereeves]

"Those snap on connectors are

"Those snap on connectors are always loose fitting BUT.... if fuel isn't leaking at thata point, air is not being drawn in.

Sounds like you have a faulty fuel pump.

Thousands of parts in my remaining stock. Not able to list them all. Let me know what you need and I'll look it up for you. Visit my eBay store at:

http://stores.ebay.com/Evinrude-Johnson-Outboard-Parts-etc?refid=store"

 

[guido2]

"Hi, Tim here. Could be proble

"Hi, Tim here. Could be problem with the check ball inside the squeeze bulb and additional weakness in the fuel pump. I would suggest a fuel pump kit and checking your fuel line for problems. First remove line from both fuel tank and motor. Carefully push tank fitting check ball into coupling with a toothpick or something similar that won't scratch the ball, then lightly clamp sides of coupling end to hold ball away from rubber o-ring(a small vise grip works great). Then blow backwards through the fuel line with lite air pressure. The check valve/ball in the squeeze bulb, if it is ok, will not allow fuel to pass backwards down the fuel line. Note: If ever your o-rings are leaking, use the vise grip method again to affect easy replacement. Alcohol fuel or many fuel additives will destroy rubber parts in time. Good luck, Tim"

 

[boardhead2009]

"Joe and Tim...thanks for your

"Joe and Tim...thanks for your input and advice. I'll attack the fuel pump rebuild first and probably invest in a new hose assembly with new fittings. I can acquire the hose assembly for under $30.00 locally. And Joe, I'll check out your ebay store. I have an ebay and paypal account. Again, thanks!"