1974 Evinrude 25hp wont run.

[Dalejam]

Answer this question only.-------When you pull the recoil handle a few times , does fuel come out of the pump , yes or no ?

No

 

[racerone]

You might have a bad pump.----Or crankcase compression ( PRESSURE ) is not driving the pump.----Or issues with your hose , bulb or tank.---Should be easy to figure out.

 

[Dalejam]

Thanks, as for pressure from crank, if you run the motor with out blocking the hole for the pulse, you can hear it and you can feel the pressure. So i don’t think it is that one. All gas related lines are all changed. Accept the line in the plastic fuel tank. I will try using a gas line just running into the tank to the fuel pump . I will try it in that configuration and post results. So I have about 4 of the fuel pumps I will rebuild them and see.
Is there any way to tell if the fuel pump is configured correctly. I watched 1 video where a guy blew into one side and it sounds like a cazooo

Thanks for the help
Dale

 

[clemsonfor]

I watched one of Danger marine's videos. (guy with british accent). He used a small rectifier from yamaha. Ran two wires from charging coil to it then red/white to battery, and a ground to block. I think it was a 20hp. Anyway it produced 13.8vdc at a little above idle. I dont know yet if that p/n he showed is still available. I just figured before I reassemble my engine I could install one.

He's Australian

 

[clemsonfor]

Thanks, as for pressure from crank, if you run the motor with out blocking the hole for the pulse, you can hear it and you can feel the pressure. So i don’t think it is that one. All gas related lines are all changed. Accept the line in the plastic fuel tank. I will try using a gas line just running into the tank to the fuel pump . I will try it in that configuration and post results. So I have about 4 of the fuel pumps I will rebuild them and see.
Is there any way to tell if the fuel pump is configured correctly. I watched 1 video where a guy blew into one side and it sounds like a cazooo

Thanks for the help
Dale

Fuel pumps on these old motors are pretty simple, and don't fail often. I would suspect one possibly if it sat for decades. But the chances that both these 25hp motors pumps and one...even Chinese...that you bought off Amazon and one you rebuilt (there is only a diaphragm or two and little blocks in them and a screen if I remember right)are ALL bad is HIGHLY unlikely in my opinion. I am not expert though so some may disagree with me.

 

[racerone]

Bypass the fuel pump on the motor.-----Have your assistant operate the manual pump.----Does the motor now start and keep running , yes or no ?

 

[Dalejam]

Bypass the fuel pump on the motor.-----Have your assistant operate the manual pump.----Does the motor now start and keep running , yes or no ?

Will try that one day this week, I also will try buy putting the hose directly in the tank and bypassing the connector and hose
In tank.
I will report back when I try these two ideas.
Thanks as always
Dale

 

[clemsonfor]

Will try that one day this week, I also will try buy putting the hose directly in the tank and bypassing the connector and hose
In tank.
I will report back when I try these two ideas.
Thanks as always
Dale

Yea that suggestion made me think the pick up in the tank may be cracked off

 

[RBoyd1971]

My nephew got a plastic tank off of Amazon and had the same problem. I immediately pulled the fitting off the tank and discovered the dip tube had a bracket holding it to the tank fitting and the tube wasn't even fitted well to the fitting the hose connects to. Was pulling up a little fuel and a lot of air. The fuel pump wouldn't pump anything. Hooked to my Evinrude metal tank and ran perfectly.

 

[Dalejam]

My nephew got a plastic tank off of Amazon and had the same problem. I immediately pulled the fitting off the tank and discovered the dip tube had a bracket holding it to the tank fitting and the tube wasn't even fitted well to the fitting the hose connects to. Was pulling up a little fuel and a lot of air. The fuel pump wouldn't pump anything. Hooked to my Evinrude metal tank and ran perfectly.

Well I have about 4 metal
Cans . So I will look inside the metal
Can make sure clean and get gas and try one. Thanks for the idea. Quick and simple . So one day this week, overtime work all week.
Thanks for the help all
Dale

 

[rico suave]

Hello all,
So I purchased this motor was sitting for a while. I replaced the points, coils (2) , rebuilt the carb . Replaced water pump .
So my issue is I have great spark, I have compression & fuel. But it does not run.
So I double and triple checked the above again.
I even regaled the plugs. I even spayed carb cleaner in the cyl put the plugs in and tried it.
Nothing. So I am going with the timing is off. How can I tell . The tiller handle could be off. I can only think it has to do with the timing for it never runs. So I am open to suggestions on how to set them up and verify what I have now that might help me.
Thank you all. Dale

I'm no expert, but your journey is similar to mine. Unless you messed with your timing it should be fine, or at least close enough. My Johnson manual had me setting my breaker points at .10, which I did. Later I saw in one of these forums a recommendation of .20 for breaker points. Presto! I would try that first. I'm guessing that the more recent CDC power packs affect the ignition from what the factory setting were and what the original power packs were.

 

[racerone]

There is no powerpack on this motor !

 

[Dalejam]

I'm no expert, but your journey is similar to mine. Unless you messed with your timing it should be fine, or at least close enough. My Johnson manual had me setting my breaker points at .10, which I did. Later I saw in one of these forums a recommendation of .20 for breaker points. Presto! I would try that first. I'm guessing that the more recent CDC power packs affect the ignition from what the factory setting were and what the original power packs were.

My gap is ok, my motor ran till I changed multiple iteams. Then it was put to me plain and simple . Do you have spark , do you have compression, do you have fuel . So the one item I can’t guarantee till the weekend is fuel making past fuel pump. So that is my quest when I fix that I will see what happens next. Thank you for your input.
Appreciate any help
Dale

 

[Newyota]

So if I go to the motor and push the button it starts right up. But I have more questions????
I took a video of the plate under the fly wheel if I can get it to run low enough the plate is junkin and jiven all over. Is that normal I think I might have a bad seal. For in the pictures you will see a lot of old oil. But the seal looks immaculate . I took it all apart put it back together cleaned I ran the motor for about 20 min. Then it was getting cold. So I will run it again tomorrow and see under the flywheel if more oil shows up. If so new seal time.
But if you can look at the pictures and small video and tell me if anything looks incorrect.
As usual thank you for all the help.
View attachment 358582

Is it my imagination or is that motor running backwards??

 

[Dalejam]

That is an illusion that happens when you video. The motor is running in the correct rotation.
Hoping to work on the fuel issue this afternoon.
Mothers Day. So have to play by ear.

 

[Dalejam]

So today I took a little time off. I beleave it was RACERONE who made a suggestion but made it simple when the motor is running is gas pumping out of fuel pump. Well I tested this theory . No it is not . So I took the papers that were sent to me , was about someone’s rants great info. Built the fuel pump by the instructions tested the theory about only one way air could be blown into it . Well it runs and stays running, so the next thing is to work on the carb settings. But enough frustration for one night . Happy it runs again . I will look up on how to set up the low idle speed at what speed the motor needs to be running at .

I want to say thank you to all who contributed to this mess I created and learned a good lesson.

Appreciate all the on-site and help.
I will let you know what happens next
Thank you
Dale

 

[Dalejam]

so after alot of trial and error, it is up and running. alot of time and questions, but you all contributed to the cause and she runs like a champ.
good news is, two young boys were looking for a motor for there boat. so i have 2 25 hp motors one for my boat that all of you helped me get running. plus another, since i didnt need two of them i sold one with all the knowledge all of you provided me i was able to apply it too both motors. so i did the right thing i sold it too them for $200.00, i probably had that much into it. either way i beleive in passing it foward. so with my motor on my boat 14 foot Sylvan 25 hp motor i can do 25 MPH WOT me alone and a cooler.

so this thread is official closed.
i want to say thank you all for the help and advice, together we can cocour any motor issues.

Dale R Johnson

 

[Crosbyman]

double happy ending... a first thanks for getting some kids interested in oldies . they will cherish it many summers to come.

wish my grad kids would take interest in stuff that involves more body work than 2 thumps