88 150 v6 running problems

[greengiant]

Need some help with the 1988 150 evinrude, the motor does not crank well but when initially cranked and warm it will idle ok. Later after running it WOT, and then stopping, it just will not fire/crank. Checked fuel primer bulb and it was not primed....reprimed and motor would fire but not start until I used the hot foot to give it gas. A mechanic suggested putting in an electric fuel pump. I understand there may be some restrictions/laws on when an electric fuel pump may be used. Someone else suggested replacing or repairing the fuel pump. Additional info: Compression on cylinders 1-5 is 90, 6 is 85. What to do? Any ideas...thanks for the feedback...
Greengiant

 

[emdsapmgr]

Re: 88 150 v6 running problems

The compression for that engine is pretty normal. Those years did not run as high as the earlier crossflows with high compression heads. Don't worry about the 5# difference. If the engine has not had a can of Bombardier Engine Tuner run through it lately, it would be a good thing to do. The Engine Tuner attacks carbon which can build up around the rings-may improve the compression somewhat and can improve starting/idling. When you said the primer ball was "not primed" do you mean the bulb was soft, or collapsed. It is normal to have the bulb go soft during operation, but not collapse. If the engine will consistently run full throttle rpm's for 10 minutes the pump may not be the culprit.

 

[greengiant]

Re: 88 150 v6 running problems

Thanks emdsapmgr. You're right about the bulb...it was soft...not collapsed. And yes in WOT there was not any problems at all. The fact I had to prime it again to get the motor to fire is baffling... especially after shutting down the motor for just a few moments.......never had this kind of situation before. And then had to use the hot foot to crank it....In your opinion will SeaFoam work as well as the Tuner? That's what I have on hand....

 

[emdsapmgr]

Re: 88 150 v6 running problems

I'd check the fuel lines to make sure you don't have an air leak, causing fuel loss after shutdown. You probably have an anti-siphon valve in the hose barb on the top of the fuel tank. Sometimes the ball in that valve will stick open, permitting the fuel in the system to drain back into the tank after shutdown. These ball valves do get dirt/sand in them and they require occasional attention/cleaning. If, when you shut the engine down (maybe for fishing) and you tilt it up for trolling, fuel can escape from the front of the carb and settle in the bottom of the airbox. This can cause hard starting due to excess fuel being recirculated into the bottom cyl (and excess smoke for the first minute or so of running.) I've got more experience with the Engine Tuner, since you can direct inject it into the fuel primer schrader valve-a nice convenience during it's application. The Seafoam is a popular product which should yield similar results.

 

[jonesg]

Re: 88 150 v6 running problems

I'd check the fuel lines to make sure you don't have an air leak, causing fuel loss after shutdown. You probably have an anti-siphon valve in the hose barb on the top of the fuel tank. Sometimes the ball in that valve will stick open, permitting the fuel in the system to drain back into the tank after shutdown. These ball valves do get dirt/sand in them and they require occasional attention/cleaning. If, when you shut the engine down (maybe for fishing) and you tilt it up for trolling, fuel can escape from the front of the carb and settle in the bottom of the airbox. This can cause hard starting due to excess fuel being recirculated into the bottom cyl (and excess smoke for the first minute or so of running.) I've got more experience with the Engine Tuner, since you can direct inject it into the fuel primer schrader valve-a nice convenience during it's application. The Seafoam is a popular product which should yield similar results.

Sounds logical,
the only time I've had to open the throttle to start my 150 was when it flooded out, I realized I had leaned against the ignition key and flooded it.