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1980 E10RCSE Fuel Problem

M

MikeEmerson

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I have a 1980 E10RCSE Evinrude outboard motor that keeps getting air bubbles in the fuel line. Replaced the fuel line with a clear hose so we could see the bubbles. At first we thought they were coming from the tank so we eliminated all the connections all the way from the tank straight to the fuel pump except the fuel bulb used to prime the line. Once all the bubbles were out of the hose entirely we discovered that the air bubble came out of the fuel pump which has been replaced. Any ideas on what would cause that problem or should we assume we received a defective fuel pump?
 
Fuel pump is driven by crankcase compression PRESSURE.----There might be an issue there.-----Have you checked INSIDE the fuel tank for a leak?---You are sure they are air bubbles ?----Or gasoline vapor ?
 
How do I check if there is an issue with the crankcase compression pressure on a 1980 Evinrude E10RCSE 2 stroke motor. ----- We have a portable gas tank and we eliminated all the fittings except for the intake cap and hose of the portable gas tank and the primer bulb so I'm not sure where there could be a leak inside the fuel tank unless it's in the cap that the intake hose is attached too on the tank. ----- I'm not sure what you mean by gas vapor but we replaced the gas line with a clear tube so we could see the air bubble gap. The hose has a 3/8" inside diameter hose and the air pocket that came out of the fuel pump and was about 1 1/2" long. Definitely big enough to cause the motor to stop running.
 
You think they are air bubbles.----I think it is gasoline vapor that looks just like air bubbles.----Post the actual compression test values on this motor.----How did the motor run for you last season ?----Is this a low hours motor or had lots of use ?----Opened low speed mixture needle to provide more fuel at idle ?
 
What's the difference between gasoline vapor and air bubbles and the causes. The motor stops running when the gap in the gas occurs.---- Not sure about the usage we purchased it used and it worked okay at first. ---- Haven't done any compression test values. ----- Not sure how to do that or what equipment would be needed to do the test. ---- How do you open low speed mixture needle to provide more fuel at idle. Sorry but I'm not a mechanic and I'm retired so on a low budget.
 
I have ordered a cylinder compression tester and a fuel pump pressure gauge and will update those values next weekend. ---- Correct me I'm wrong but the gasoline vapor you talk about is caused by heat. ---- What would cause that problem in the running motor at trolling speeds? ---- We have tried adjusting the low idle speed knob but that doesn't completely solve the problem. Eventually it stalls when running the motor at trolling speeds after the gap in the gas line appears.
 
Sorry for the delay to supply the pressures. The compression on the top cylinder is 105, the bottom cylinder is 110. Also tested the pressure that occurs between the fuel pump outlet and carburetor inlet and it was 1.5 to 1.7 pounds. The motor didn't stop when checking pressure at the fuel pump inlet which maintained 10 or above without the motor stopping due to a lack of fuel. Also adjusted the low speed mixture needle but problem was not solved.
 
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