Trouble bleeding out air

[Rancher Dan]

Hi, this my first time here. So I'm very happy to find this site. My problem is getting the air out of my D850 gen set.

I read the very good " how to bleed kubota fuel injector lines" and did just what it said I should do but no go.
I have in the past 8 years had this problem once on a fuel filter change and bled at the injector bleed valve and it started up with no problems.
Once when I took the gen set out of the light tower box and mounted it on skids.
And this time when it ran out of fuel. I did what OT said to do but it did not work for me.
Last time a friend stopped by when I just mounted it on the skids and we were using a small tank for fuel to get it started. My friend got fuel down to the filter then bleed there. then he stuck a compressor wip into the fuel line to push fuel out of the cracked injector nuts and we were able to get it started.
This time I have not used the pressure trick because it seems like it would be jacking a lot of air into the system and with both of us one using the wip and the other cranking and closing the injector nuts as it started to fire.
Any ideas.

P.S. any ideas where to get a new bleeder valve the handle broke off.

 

[olthumpa]

Bleeding a D850 engine.
https://www.youtube.com/watch?v=XJn2kDnWQPU

 

[Rancher Dan]

Thanks oltumpa but i have watched the video and read the article. My tank is above the kubota and there is no place for air to get stuck between the tank and the filter. I had the same problem the last time I tried to get it running but no go till my friend came over and help me by putting pressure to the fuel. So still stuck.
Thanks again.

 

[ShaunRH]

The pressure is just giving you feed into your injector pump.

It sounds almost like your injector pump is marginal on pressure going to the injectors as well but that would have to be diagnosed.

If you are frequently running the system out of fuel you could try a bulb pump based pressure assembly AFTER the filter. (I have never done this but it should work if air pressure did.)

Find a fuel primer bulb:
http://www.ebay.com/itm/Universal-3...tor-/261759027954?hash=item3cf20dcaf2&vxp=mtr

Put it in line after the filter. (It should have the check valves and everything in it so you need to install it in the right direction.)

Refill your tank and crack open your injectors lines.

Squeeze that bulb hard until you get fuel flow (you might need a Jorgensen clamp or something else to apply a hard force enough to get the flow, don't know how much it will need.)

Close injectors as they get noticeable fuel flow or just try to get one fired up. Whatever works for you.

You should be able to leave the bulb in line since it's on the lower pressure side.

Just an idea that might work for you.

 

[Daren Todd]

They use a primer bulb quite often on small cat and Perkins diesels. It's quite effective. Got a small cat engine at the shop right now with that set up. Bulb actually hooks to the intake fuel line before the fuel filter

 

[mrmr56]

I have gotten a balky bleed procedure to work before by clamping down on the return line from the injectors to the pump. You might have to clamp the return line to the tank too if the check valve is not working as it should. It might be worth a try.

 

[Daren Todd]

Here's a pic of the primer bulb set up.

Sent from my iPhone using Tapatalk

 

[ShaunRH]

Before or after shouldn't matter that much unless you need to fill the filter and the injector pump, then before would likely be better, so cool with that.

I was just thinking of ways to do it. I've seen it on gas engines, especially marine ones, but figured it might work in this case as well.

 

[Daren Todd]

Before or after shouldn't matter that much unless you need to fill the filter and the injector pump, then before would likely be better, so cool with that.

I was just thinking of ways to do it. I've seen it on gas engines, especially marine ones, but figured it might work in this case as well.

It's mainly personal preference. I prefer the squeeze bulb closer to the fuel source. It's much easier to push the fuel, then it is to pull it with a vacuum. Then you can also tell if you have a loose clamp at the fuel pump or filter allowing air into the system. Just give the bulb a good squeeze and look for leaks

 

[ShaunRH]

True, I was looking at the filter cleaning the fuel of any gunk that could clog the check valve on the bulb... so I guess potato po-ta-to...

 

[Tooljunkie]

Marine type primer ball. Pretty easy.