Bleeding air from fuel system on Universal M 25 in a CD 31

[Capt Hook]

I've never tried to bleed the air from the fuel system on my boat.

I saw a video on You Tube on how to do it (on another type engine). It showed a manual pump on the engine used to pump fuel up to filter, injectors, etc.

It's been awhile but it seems like when I looked in the manual for the engine it didn't mention any manual pump and I haven't seen anything that looks like one. I think instead it said to use the starter to turn the engine over. It would be very difficult single handed to turn the engine over with the starter while trying to loosen a connection in the fuel line to bleed air out.

What am I missing.

Help from anyone with a CD 31 or an M 25 would be appreciated.

[Steve Laume]

I am pretty sure you have a lift pump for diesel fuel delivery on your engine. All you need to do is turn on the ignition key. You should be able to hear a slight clicking in the engine compartment which will be the pump, pushing fuel. Once the key is on just losen the bleeding screws a bit until the air bubbles stop. It can't get much easier, Steve.

[Capt Hook]

I am pretty sure you have a lift pump for diesel fuel delivery on your engine. All you need to do is turn on the ignition key. You should be able to hear a slight clicking in the engine compartment which will be the pump, pushing fuel. Once the key is on just losen the bleeding screws a bit until the air bubbles stop. It can't get much easier, Steve.

So just turning on the ignition, not engaging starter. That makes sense. I'll have to go back and read what the manual says again.

Maybe I misread.

[Steve Laume]

Yup, just turn on the key. The only reason you would want to engage the starter is if you had an engine driven fuel pump which is not the case with your engine. Bleeding these engines is very easy. Just crack the screw, wait for fuel and close it again. The lift pump will send a constant stream your way, Steve.

[Capt Hook]

Steve, you are absolutely correct.
Just read the manual again and it does say just to turn the ignition key to the "ON" position.
Maybe when it says start the electric fuel pump I jumped to a conclusion without reading carefully.
This board is a great place to ask dumb questions.

[Keith]

There are no dumb question except those questions that are not asked!

[Neil Gordon]

>> The only reason you would want to engage the starter is if you had an engine driven fuel pump ...<<

That's why there's also a manual lever on the engine driven pump. Crack the bleed screw a turn and a half, pump until you're getting fuel, tighten the screw and dab up the dribbles.

[Sea Hunt Video]

That's why there's also a manual lever on the engine driven pump. Crack the bleed screw a turn and a half, pump until you're getting fuel, tighten the screw and dab up the dribbles.

That is what I was taught for the Yanmar 1GM. I was also told to apply a small amount of yellow (or red) fingernail polish to the head of each "bleed screw" along the fuel line so that I would know where each bleed screw was located and would bleed them in the proper order - fuel tank to injector.

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