Johnson 75hp fuel problem

[Bearskin9898]

I have a Johnson 75hp stinger.

When I went to launch the boat the primer bulb was already rock hard. I opened the top on the gas tank a bit and quite a bit of pressure came out. Still couldn't prime it as it was already hard. I also noticed that if I squeezed it really hard that gas would squirt out from around the fuel pump. I tried starting the motor and it wouldn't start. After that I could finally squeeze the bulb about one time before it was hard again. Motor still wouldn't start. I assumed I had flooded it and let it sit for about 25 minutes. After holding the key for about 5 seconds you could hear the motor starting to turn over. After messing with the choke and idle lever I finally got it started and it ran just fine. I had shut it off and it started right back up 30 minutes later. What could the problem have been?

 

[boobie]

Have to trouble shoot it when it acts up again.

 

[Bearskin9898]

Have to trouble shoot it when it acts up again.

Well yeah... That's the point of this post I don't know where to start looking or what I should be watching for or trying.

 

[boobie]

First thing to look for is does it have spark ?? By the way, do you have a model # ??

 

[Bearskin9898]

I mean I assume it does since I got it started and it ran fine after that and started right back up. Not sure on model number.. 1977 johnson 75hp stinger

 

[boobie]

But did it have spark when it WOULDN'T START ????

 

[Fed]

Vent the tank.

 

[Bearskin9898]

But did it have spark when it WOULDN'T START ????

Lol well doesn't make any sense that it wouldn't spark at all then suddenly spark, run fine then start back up just fine when I went to start it 30 minutes later.........

 

[IDFISHER]

Vent the tank.

What he said. Excess pressure built up in the tank has nowhere to go but through your hose and into your fuel system, likely flooding it. You might want to address the leak around the fuel pump while you're at it.

 

[Silvertip]

Rock hard primer bulb, fuel squirting from fuel pump, messing with the choke and idle lever, holding the key --- all sounds like improper starting procedure so lets start there. 1) Make sure the fuel tank vent is open, 2) If the primer bulb is already firm, there is no need to squeeze the poor thing until something ruptures (like a diaphragm or gasket in the fuel pump). 3) Raise the fast idle lever about 1/3 - 1/2 up. 4) Turn the key to START and push IN on the key to choke. 5) When the engine fires, lower the fast idle lever to a more comfortable idle. If the engine tends to die off quickly push in on the key again for just a second. 6) With the engine warmed up, move the fast idle lever full down and go boating. And for future questions, motor turning over means the starter is spinning the engine. This is exactly the same thing as the engine "cranking". "Firing is what an engine is doing when it is trying to start. Cranking or turning over means the engine is rotating but not starting.

 

[Bearskin9898]

Rock hard primer bulb, fuel squirting from fuel pump, messing with the choke and idle lever, holding the key --- all sounds like improper starting procedure so lets start there. 1) Make sure the fuel tank vent is open, 2) If the primer bulb is already firm, there is no need to squeeze the poor thing until something ruptures (like a diaphragm or gasket in the fuel pump). 3) Raise the fast idle lever about 1/3 - 1/2 up. 4) Turn the key to START and push IN on the key to choke. 5) When the engine fires, lower the fast idle lever to a more comfortable idle. If the engine tends to die off quickly push in on the key again for just a second. 6) With the engine warmed up, move the fast idle lever full down and go boating. And for future questions, motor turning over means the starter is spinning the engine. This is exactly the same thing as the engine "cranking". "Firing is what an engine is doing when it is trying to start. Cranking or turning over means the engine is rotating but not starting.

Thanks appreciate it

 

[oldboat1]

Lol well doesn't make any sense that it wouldn't spark at all then suddenly spark, run fine then start back up just fine when I went to start it 30 minutes later.........

Actually does make sense. That's the problem with trying to troubleshoot electrical issues.

Also as was mentioned by another poster, your starting procedure is worth examining. I'm not sure if the Stinger is new enough to have a primer rather than a choke, but use of a primer often seems to invite some procedural issues.

Primer bulbs are another source of issues -- need to be squeezed slowly and released, not mashed down.