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Johnson 4 stroke 115 hp will not start. fuel

Johnson 4 stroke 115 hp will not start. fuel flows through filter, but spark plugs are dry

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  • Anonymous Mar 18, 2014

    28 hp johnson

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Sounds like and injector problem to me. If it was a 2 stroke I'd tell you to pull the carbs and clean them ,but EFI is a whole different story. Most certaintly a fuel problem, most likely injector related, you'll most likely need to go see a marine mechanic with the proper equipment to analyze, rather than start replacing parts you may not need.

Posted on Jun 23, 2009

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What could I damage on my boat fuel line? Primer bulb, any filter ... ?


There could be several reasons. I'd first look at stuck floats in the carbs. I believe there's 3 carbs and if all spark plugs are wet all floats are sticking.

But assuming it didn't overheat, and the spark plugs are wet with fuel (as opposed to water) - sometimes a defective coil will short out only when it gets warm (most time they short all the time). They can be tested.

A very good mechanic once told me there are only four things to concentrate on: Suck, Squish, Bang, and Blow. In other words, Fuel delivery, Compression, ignition system/spark, and proper exhaust. My experience has been that I've never had to worry about Blow (knock on wood) with an outboard. Others have however.

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1 Answer

I have spark and getting fuel won't start


if its a 2 stroke then you need fuel spark and air to get the bike to start have you got compression? check it by removing the spark plug and put your finger over the hole air try and start the bike your finger should be pulled into the hole if not then a piston ring is either cracked or broken

open the air box and check the filter then clean the carb thats all you need for a 2 stroke

if its a 4 stroke then again check the air filter and compression remember that a 4 stroke doesnt have the oil with the fuel it goes in a separate chamber

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John

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1974 Johnson 70 hp outboard, quits on acceleration.


It sounds like your motor is starving for fuel. At an idle, you have adequate flow to keep the engine running. When you call for more fuel...you sputter and quit. Could be a clogged filter or trash in the line or in a jet. Yes you will have some air in the bulb, but not a great deal. You could be sucking air at a hose connection (loosing some prime)...try this, start the engine and slowly accererate, have someone pump the bulb as you accelerate, see if the engine works properly while doing this test.

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If you have rebuilt the carb check for carb gaskett leak that caused and let the air flow in
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After your engine warmed up the heat in the compression burn much faster so you have to let air in by turn off the choke
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1 Answer

WONT START


Not so many reasons she won't start. 4-Strokes are Simple!

Here they are:

Motor:
Fuel Tank-> Fuel Line-> Fuel Filter-> Carb-> Intake (Valve)-> Piston-> Exhaust (Valve)-> Muffler

Carb (Old Style):
Fuel Side:
Fuel Bowl-> Float-> Needle Seat-> Fuel Ports (Venturi)
Air Side:
Air Filter-> Carb Air Intake-> Butterflies (2)
(Clean 'em ALL!)

Hardware (Motor):
Rotor (Magnets)-> Magneto (Ignition Coil)-> Spark Plug Wire-> Spark Plug-> Cylinder Head (Spark Plug Ground)

Ignition:
Kill Switches (Seat, Clutch, etc.)-> Spark Plug/Ignition Coil-> Ground
Key Ignition-> Battery->Starter/Generator

If one of those fail.......= Non-Starting 4-Stroke!

Fixes-
Fuel:
You are either getting too much, or too little. Too much = Carb.
Too little = Carb. Therefore, tear down the Carb (COMPLETELY-Careful!) and clean it up.

Electrical:
Grounding out the System (Kill Switches)
Battery-> Ignition-> Starter.
Magneto->Plug Wire->Plug (Check 'em all!)


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1 Answer

Water in the fuel tank of my Zodiac dinghy with Yamaha 2001 50 HP


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