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Old 06-24-2019   #1
flyidaho
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Default Bleeding the fuel lines, bet this have never been asked before

On my D1103 3 cylinder engine on my Jacobsen mower, I recently needed to replace the main fuel line from the tank to the pump. The engine ran fine before BTW. This involved removing the fuel tank to get at one hose clamp. So I replaced the line, installed the fuel tank, and filled it about half way up, and it fired right off. But (of course) after maybe 30 seconds it puked out, and this engine does not have a primer pump like my old Mercedes 190D or another older Kubota 3 banger I used to own.

I have a vague idea that I need to crack all three of the injector lines on top of the cylinders, and crank the engine until fuel is visible, but not sure if I should do that one at a time or all at once, or if it matters. I feel foolish asking this as this a classic diesel issue, but it's been so long since I have run one dry i need a reminder. I'm going back out to the shop now and trying cracking all three lines and cranking, and will report back.
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Old 06-24-2019   #2
AllDodge
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Default Re: Bleeding the fuel lines, bet this have never been asked before

I would loosen them all until fuel shows up, then close down 2 and try some more.

Some of those motors have an electric fuel pump and can be run by turning the key between run and start. This would be a place where the glow plugs of such would be used
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Old 06-24-2019   #3
Dave_eng
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Default Re: Bleeding the fuel lines, bet this have never been asked before

Look for a special fitting on the injection pump. I am not certain on your particular engine but many have such a feature to allow air to get out of the pump quickly.

A close up photo of the pump would help.

The attached page is not your engine but provided to get you looking

When bleeding the injectors have the throttle wide open. I prefer to do one injector at a time but that is just my way.

Dave
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Old 06-24-2019   #4
North Idaho Wolfman

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Default Re: Bleeding the fuel lines, bet this have never been asked before

Look for a lever on the side of the lift pump, some of the jacobson's had that feature on their units.
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Old 06-25-2019   #5
thepumpguysc
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Default Re: Bleeding the fuel lines, bet this have never been asked before

Its MUCH quicker if u loosen them all at once..
Spin the engine AT FULL THROTTLE until they all squirt & stop & tighten the lines..
Now off u go..
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Old 06-25-2019   #6
flyidaho
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Default Re: Bleeding the fuel lines, bet this have never been asked before

I cracked all three at once, and cranked until a bit of spurting took place, but also still air bubbles (in retrospect) were visible. Then the battery got low. After tightening them back up, it fired up but ran crappy. Then some visitors stopped by, with a box of wine, and the work was put on hold for the day!

Next move is to do it again, but more, with a charger on the battery, shouldn't be an issue I'd bet.
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Old 06-25-2019   #7
AllDodge
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Default Re: Bleeding the fuel lines, bet this have never been asked before

Quote:
it fired up but ran crappy.
Just let it continue to run until all the air is purged, it will do it, may take a bit
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Old 06-25-2019   #8
Henro
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Default Re: Bleeding the fuel lines, bet this have never been asked before

Quote:
Originally Posted by flyidaho View Post
... Then some visitors stopped by, with a box of wine, and the work was put on hold for the day!
Hey, my kind of friends!

Prefer a case of beer though...
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Old 06-25-2019   #9
flyidaho
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Default Re: Bleeding the fuel lines, bet this have never been asked before

Well I didn't expect this: I bled the heck out of it, and all I can get is very rough running, obviously not getting proper fuel flow. Keeping in mind it ran great before I pulled the old fuel line and the fuel tank. bled it again, and again, and it just doesn't get any better.

Here's a picture of the injection pump. What caught my eye was the "fitting" on the lower right, marked with a little red paint it looks like. I will try pushing on it with a tool, a finger pushed didn't move it, not sure what it is?
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Old 06-25-2019   #10
North Idaho Wolfman

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Default Re: Bleeding the fuel lines, bet this have never been asked before

Pull the line going to the injection pump, it should have full flow to it if it doesn't then something before it is plugged up, or failed.
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