6 hp 4 stroke won’t run when connected to external tank!

[redlinj]

2012 evinrude 6 hp 4 stroke, made by Tohatsu, won’t stay running when connected to the external tank! Hard starting and then will run rough and die out even with a new spark plug! Disconnected the hose to get new gas thinking bad gas might be the problem! Just for s & g, pulled the starter rope and she fired right up and ran great burning what gas remained in the fuel filter. Reconnected the line, squeezed the bulb a couple times and engine again would not start! Disconnect once again and she fired right up? Used another tank and line and same things happen! Any ideas?

 

[racerone]

Float valve in carburetor needs attention.

 

[tphoyt]

Just wondering if your tank vent is open!

 

[redlinj]

Float valve in carburetor needs attention.

How so? Took the carb off and checked the float and needle valve! All works as it should! Lift the float up, needle seats, let float down, needle drops ! Pump the bulb once, won’t start! Twice, and carb floods! Remove the fuel line, and motor starts! I can play with the float—should I adjust it up or down! BTW, vent on the external tank is open! Any other possibilities ?

 

[racerone]

Your carburetor needs attention I say.

 

[tphoyt]

When you say the carb floods do you mean fuel comes out of it?
If so your float must be sticking.

 

[tphoyt]

You mentioned old gas.
Has this motor been sitting for awhile?
You may need a good through carb cleaning.

 

[redlinj]

Just received a replacement carb in the mail, albeit an aftermarket one! Installed it and the flooding still exists! Disconnect the fuel line from tank to motor an the engine runs fine! Coincidence? I don’t know! Any other possible explanation! I’ll still play with the float, but there are no other adjustments that can be made that I can see! And, as mentioned earlier, this evinrude is made by Toshiba! And yes, gas was 16 months old!

 

[oldboat1]

Borrow or buy a replacement fuel line connector (motor).

 

[racerone]

Perhaps made by ----TOHATSU------I think.

 

[Crosbyman]

try openning the fuel cap on the tank to ensure proper venting and keep any tank pressure build up from pushing to much fuel to the engine and overriding the inlet needle and flooding the carb .

 

[tphoyt]

This one boggles the mind for sure.
What is this motor mounted on? Is it on a sail boat and your tank is higher than the motor at the moment causing a siphon maybe?

 

[redlinj]

Don’t recall taking the cap off the tank, but the vent was/is open. Motor was a kicker but wouldn’t start this year! In a barrel now and the tank is on the ground! When squeezing the bulb, it does get very hard and fuel appears to leak out all around the carb and the spark plug gets saturated! Will fiddle around with it in a little while! Is is possible that the fuel pump could be the cause somehow? When you squeeze the bulb, should the fuel stop at the fuel pump? Or shoot right thru it to the carb? That’s what appears to be happening!
Oh, and yes, it’s Tohatsu, not Toshiba! I knew it was one of those T words!

 

[Crosbyman]

inlet needle should stop the inflow of excess gas ... manually pumped or fuel pumped

try taking the cap off vents get plugged sometimes

 

[racerone]

Just fix the issue with the float and float valve !!.------The primer bulb is a manual fuel pump.-----It pumps right through the motor fuel pump to fill the carburetor.-----Saves your arms and shoulder from having to operate the recoil to fill the carburetor !

 

[tphoyt]

Once the bulb is hard there is no need to keep squeezing it and forcing fuel.
You said the motor runs without the hose hooked up correct? If so just for kicks start it without the hose hooked up. Just when it starts to stall From running out of gas hook the hose up and see what happens.

 

[redlinj]

Ok Shipmates, perhaps the problem has been solved! On the original carburetor, there is a Welsh plug covering a mixture screw! Really wasn’t familiar with these plugs! The new aftermarket carb came without said plug so you could see the screw! This turned out to be the problem! The new carb mixture was screwed in tight! Backing off 1.5 turns got the motor running nicely! Evidently, no problem exists with the tank, hoses or fuel! Unfortunately, spent $60 on a carb that I may have not needed! Thanks all, for your thoughts!