67 johnson 40 / no fuel

[ssschoeni]

I have a 1967 johnson 40 horse. I got the motor with no spark and fixed the problem with new points and condensers. Now it seems the engine is not drawing in fuel. I can make it run by shooting fuel with a squirt bottle into the carb but when i stop, the engine quits. It doesn't even try to pop. I replaced the fuel pump and pulled the carb and cleaned it, but still nothing. Any ideas as to why it won't suck fuel?<br />It has really good compression and sounds great when I feed it the gas.

 

[rwise]

Re: 67 johnson 40 / no fuel

stopped up fuel filter, air leak between pump and tank, connector not seated, stopped up fuel line, bad bulb, bulb in line backward, (should be an arrow on buld that shows flow direction) Make sure (if it has it) that the tank vent on the gas cap is open.<br /><br />If you pump the bulb does it get hard?<br />If so, take the fuel line off at the carb and see if you can pump gas through it. If you get gas there with the bulb, then try cranking the engine and see if it pumps gas. If it does then look at the float and needle valve.<br />If not, remove the fuel line from the connector at the engine, and see if gas will pump to there. If not try another bulb, fuel line, tank. Some tanks have a one way valve in them that can cause problems.<br /><br />Hope this helps you find the problem!

 

[ssschoeni]

Re: 67 johnson 40 / no fuel

The tank is working fine. i have a boat with a 62 75 horse I rebuilt and it's the same tank i use for that engine. I pulled the fuel line off of the carb from the fuel pump ( all the lines are new ) and it just barely makes a trickle of fuel when i crank the engine. I checked the float and needle valve and they seem to look ok and the float and needle move freely. How much gas should that pump move. I put my thumb over the end and it doesn't seem to put pressure against my thumb that I can feel. The pump is brand new. Any ideas as to why it doesn't move more gas or is a very slight trickle right?

 

[rwise]

Re: 67 johnson 40 / no fuel

the pulse line from the pump to the block, did you replace it also? If it is leaking (or pluged, kinked) it could cause a problem also. I would think it needs to more than a slight trickle of fuel to make it run. Is any gas getting into the carb?

 

[ssschoeni]

Re: 67 johnson 40 / no fuel

The pump is mounted directly to the side of the block. There is a small hole in the center that appears to go through the inspection cover and all the way into the piston. The only lines on the pump are the inlet from the tank and out let to the carb. I can hear the gas enter the fuel bowl when i pump the ball so it's getting through with the ball but I'm not sure if the pump is able to move gas to the carb. I can't even get a sputter unless I shoot the gas into the carb throat with a spray bottle. Even after i get it running with the spray bottle it dies as soon as I stop spraying. Also, i don't feel all that much suction on the front of the carb when i cover it with my hand and crank the engine.

 

[stairliftoheaven]

Re: 67 johnson 40 / no fuel

if you've got fuel in the float chambers, the engine should at least run for a few seconds. sounds like blocked jets to me. Fairly easy job to rebuild. good luck

 

[ssschoeni]

Re: 67 johnson 40 / no fuel

I pulled the carb apart already and rebuilt. Still nothing. does that lack of suction at the carb throat sound like an issue? Could I have a leak of some kind? I'll try a rebuild kit for the carb and dunking it in the carb dip but when i remove the fuel adjuster for the low speed on the top of the carb and spray fuel in, it comes out in the carb so I'm not sure where it would be blocked. Is it possible for a seal to be bad and it not allowing enough pressure to 1) run the fuel pump and 2) draw fuel into the engine.

 

[ezeke]

Re: 67 johnson 40 / no fuel

Try setting the tank above the engine so that the fuel will gravity feed and see if it will run.

 

[ssschoeni]

Re: 67 johnson 40 / no fuel

Just tried the tank above the engine. Still didn't do anything

 

[ezeke]

Re: 67 johnson 40 / no fuel

Try removing the low speed needle valve again and then put a little pressure on your primer bulb to see if you can see fuel flowing. If you cannot, I would suspect that the float valves are stuck.

 

[rwise]

Re: 67 johnson 40 / no fuel

it does sound like a carb problem, as was stated before, if it has gas in the carb and wont run, that sounds like passage/s in the carb stopped up. And yes there are seals in the crank case that could cause problems. But, I would give the carb/s a good cleaning first and kit/s. if that dosen't get it then look further. where the fuel pump fits into the block, did you replace the seal (O-ring?) there? you don't want it to leak.

 

[netsmith2001]

Re: 67 johnson 40 / no fuel

Can I jump in here with my similar problem ?<br />I have a 78 Johnson 70.<br />It was running beautifully.<br />A couple times recently it would start, then stop right away like a vacuum seal in the fuel tank but with the tank cap off it still does it.<br />Then after a few more tries it would kick in and start and run fine.<br />This pattern repeated one more time - (start, then die right away - work it a bit until it would start and stay running just fine).<br />But then today - I could not get it to stay running. One time it started and idled but as soon as I put it in gear it died.<br />Then I took it out of the water and put the muffs on to flush fresh water through and it started and ran perfectly and I even put it in gear! Frustrating !<br />It is as though something intermittent is interfering with fuel flow.<br />Any ideas how to proceed ?

 

[ssschoeni]

Re: 67 johnson 40 / no fuel

I rebuilt the carb and I got it running. Thanks for the info. I do have a new problem now. The first time I start it up cold it fires and runs fine. After shutting it off, It will fire and run for 3-5 seconds and then stall. No matter what I do with the idle adjustment, choke or bulb on the tank it does the same thing. The fuel bowl is full and the bulb ia hard. Any ideas?

 

[ssschoeni]

Re: 67 johnson 40 / no fuel

Thought of onemore thing. It seems every now and then when I have it running on the stand and work the throttle by hand I get a little tickle of electricity. I checked the ground and it looks good. The wiring harness had been cut for this engine and currently it does not shut off with the key. Am I missing a wire that needs to be connected to the switch? What is the silver colored dome on the side of the engine opposite the fuel pump that has the wires from the coil running to it?