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How to bleed fuel system on C12 with no hand pump?
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Tazzerblue
Posted 1/5/2015 12:56 (#4288868)
Subject: How to bleed fuel system on C12 with no hand pump?


SW MN
1999 sterling with C12, no hand primer. should I open bleed screw and crank? or just crank?
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FarmerFrank
Posted 1/5/2015 13:38 (#4288959 - in reply to #4288868)
Subject: RE: How to bleed fuel system on C12 with no hand pump?


NE Iowa
You can try taking a paper shop towel, soaking/wetting it with gas and laying it over the air filter. Leave the cover off the filter so if/when it starts you can remove the towel. Might be best to have a second person there.
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4WD
Posted 1/5/2015 13:54 (#4288988 - in reply to #4288868)
Subject: RE: How to bleed fuel system on C12 with no hand pump?


Between Omaha and Des Moines, 7 miles South of I80

I would probably loosen #5, {or remove it, then screw back in about 1.5 to 2 full turns}

 then crank, for 20-30 seconds,

 stop and retighten #5 check valve (just snug = don't over-tighten !!!);

 then try to start engine.

Edit: How much air do you think you have in the system? (a little or a LOT?)



Edited by 4WD 1/5/2015 13:57




(c-12 fuel fitler base photo.jpg)



Attachments
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Attachments c-12 fuel fitler base photo.jpg (77KB - 1075 downloads)
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flatlander67
Posted 1/5/2015 14:22 (#4289031 - in reply to #4288988)
Subject: RE: How to bleed fuel system on C12 with no hand pump?



SW IA
Mike

Thanks for posting, I always learn something from your posts!
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Super 65
Posted 1/5/2015 14:57 (#4289095 - in reply to #4288868)
Subject: RE: How to bleed fuel system on C12 with no hand pump?


South Central Kansas
Remove the return from engine line at the fuel tank and add air pressure to the tank through that fitting into the tank
and crank engine. Air will purge out of system quickly with this method.

Edited by Super 65 1/5/2015 14:58
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Tazzerblue
Posted 1/5/2015 14:58 (#4289099 - in reply to #4288988)
Subject: Thanks, that was my first thought.


SW MN
loosing up #5 was my first plan just didn't know how long to crank. I hadn't cranked any yet. installed new filter. Have you ever pressurized the tank to force fuel up there? or is that a bad idea?
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Tazzerblue
Posted 1/5/2015 15:00 (#4289103 - in reply to #4289095)
Subject: I assume i will have to be crainking engine to purge?


SW MN
while pressurizing tank?
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4WD
Posted 1/5/2015 16:16 (#4289258 - in reply to #4289099)
Subject: RE: Thanks, that was my first thought.


Between Omaha and Des Moines, 7 miles South of I80

Honestly, most guys fill the fuel filters, screw them on, hand pump the primer a few times and start the engine. No bleeding at all.

Others, WITH a CAT hand primer pump, just install empty filters, loosen #5, hand pump, until they feel some "resistance" and probably see a little fuel come out loose threads(of #5), then snug #5 and start engine.

The biggest disadvantage, to cranking with empty filters, is that it does have to "push" ALL THE AIR, right passed the injectors themselves, before it (the air) gets to go out under #5's loosened check valve and shoots out thru return fuel lines, back to the fuel tank/s. {= increases the possibility for some air to get inside injectors and that makes an engine harder to get started VERSES an engine, whos injectors never had any air around its injectors.}

Now, You could also use a Marine-style boat fuel primer, and suck fuel out of truck's fuel tank, to fill filters = remember lots of this fuel has already been filtered, because it has been circulated thru the engine (and its filters) because fuel is used as a coolant to keep injectors cool, on that engine. Just don't suck off very bottom of tank.

Here's a photo:

 

Note: You would still have to loosen #5 check valve, for that "fuel tank pressurization thinky/idea" to work = check valve is roughly 60-65 psi setting, so if it is snugged down(as normal) NO WAY will 5 psi, of shop air, in the truck's fuel tank; push out any air.



Edited by 4WD 1/5/2015 17:47




(Boat fuel primer bulb and hoses.jpg)



Attachments
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Attachments Boat fuel primer bulb and hoses.jpg (9KB - 900 downloads)
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FarmerFrank
Posted 1/5/2015 16:17 (#4289260 - in reply to #4288868)
Subject: RE: How to bleed fuel system on C12 with no hand pump?


NE Iowa
If all you did is changed a fuel filter, if you filled the filter before putting it on, you shouldn't need to bleed it! If you do at least you know how now! But I wouldn't take anything loose and chance letting it get a air-lock someplace!
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dfuller
Posted 1/5/2015 18:01 (#4289517 - in reply to #4288868)
Subject: RE: How to bleed fuel system on C12 with no hand pump?


Beloit, Ks
We had a truck that way. Had problems so bought hand pump to put on.
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Super 65
Posted 1/5/2015 18:40 (#4289645 - in reply to #4289103)
Subject: RE: I assume i will have to be crainking engine to purge?


South Central Kansas
Tazzerblue - 1/5/2015 15:00

while pressurizing tank?


Yes. Pressure in the tank will push air out of system through the return line. After engine starts let pressure out of tank and hook return line back up.

Edited by Super 65 1/5/2015 18:43
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Istumped
Posted 1/5/2015 20:27 (#4290055 - in reply to #4289517)
Subject: RE: How to bleed fuel system on C12 with no hand pump?


ne il
Never had that problem. I always filled new (both)filters with fuel and installed them. Turned key and it starts.
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Tazzerblue
Posted 1/5/2015 21:51 (#4290429 - in reply to #4290055)
Subject: Here's my results


SW MN
I looked over the fuel tanks and thought that was a lot of work to disconnect and then there was the overflow line/vent. I did not fill filter with fuel as that would not have been filtered. So I loosened bleed screw and truck started right up, and stayed running. so after a few seconds I tightened the screw and left it run for a few minutes. All is good.
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Istumped
Posted 1/5/2015 21:59 (#4290467 - in reply to #4290429)
Subject: RE: Here's my results


ne il
Fill filter next time. Surely you have a filter on your bulk tank?
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4WD
Posted 1/5/2015 22:00 (#4290472 - in reply to #4290429)
Subject: RE: Here's my results


Between Omaha and Des Moines, 7 miles South of I80

Good for you, But I am surprised, that you got ALL the air out, from two empty fuel filters(primary and secondary) and the engine didn't studder, misfire and die on you while it was trying the flush out the air bubbles.

 

Note: I'm making the assumption that you did BOTH fuel filters, at the same time, maybe you only did just one.(1/2 the air volume to purge)

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