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01-16-2018, 10:49 AM
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#21
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Bus Nut
Join Date: Feb 2016
Location: in the bus on the road
Posts: 529
Year: 1998
Coachwork: myself
Chassis: amtran
Engine: international dt466e allison md 3060
Rated Cap: 13 ton or so says the tit
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Quote:
Originally Posted by Rusty
You all may have a primer on your bus and not even know it.
Cummins 6CTA mechanical lift pump has a rubber knob you push to manually prime- keep going until it fims-up and you hear the 'squish'.
My bus had this type of water separator on it- it has a primer built-in. Same deal, pump it until you hear it squirt- it may take 100 pumps, but it will firm-up when air is gone.
Attachment 18514
Diesel engines circulate the fuel- it doesn't just go straight into the engine and get burned, there is a flow that is used to cool the pump and the pressure performs some work.
I have 24V 5.9L Cummins and it is fussy about fuel pressure; too little and it dies. I put a Air Dog Raptor electric fuel pump and all new (empty) fuel lines.
I bumped the key 3x, waiting 20 sec between, and it filled and primed 30' 3/8 line w/ just 3 bumps. A bump on the starter activates the electric lift pump for 15 seconds, hence the bump.
Loosing prime on a diesel engine is no joke and even prof truckers have trouble getting re-primed at times.
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My last bus, a carpenter with a 5.9 had that. This bus doesn't tho. It would be nice....
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01-16-2018, 11:01 AM
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#22
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Bus Geek
Join Date: Sep 2017
Location: Owasso, OK
Posts: 2,627
Year: 1999
Coachwork: Thomas
Chassis: Saf-T-Liner MVP ER
Engine: Cummins 6CTA8.3 Mechanical MD3060
Rated Cap: 46 Coach Seats, 40 foot
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I only wish my 6CTA had that.
Instead it has a simple fuel filter with no drain, and no primer on top either:
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01-16-2018, 11:09 AM
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#23
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Traveling
Join Date: Nov 2015
Location: Midwest
Posts: 2,573
Year: 2003
Coachwork: BlueBird
Chassis: TC2000
Engine: 5.9L Cummins
Rated Cap: '00
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Quote:
Originally Posted by Twigg
I only wish my 6CTA had that.
Instead it has a simple fuel filter with no drain, and no primer on top either:
Attachment 18515
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That is the separator and they wouldn't need a second primer there.
Go find your lift pump - that is where your primer is on 6 CTA.
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01-16-2018, 11:15 AM
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#24
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Bus Geek
Join Date: Sep 2017
Location: Owasso, OK
Posts: 2,627
Year: 1999
Coachwork: Thomas
Chassis: Saf-T-Liner MVP ER
Engine: Cummins 6CTA8.3 Mechanical MD3060
Rated Cap: 46 Coach Seats, 40 foot
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Quote:
Originally Posted by Rusty
That is the separator and they wouldn't need a second primer there.
Go find your lift pump - that is where your primer is on 6 CTA.
Attachment 18518
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You keep making me go out in the cold, dammit
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01-16-2018, 11:17 AM
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#25
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Bus Nut
Join Date: Dec 2017
Posts: 973
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Quote:
Originally Posted by Twigg
You keep making me go out in the cold, dammit
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[emoji23]...
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01-16-2018, 11:25 AM
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#26
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Bus Geek
Join Date: Sep 2017
Location: Owasso, OK
Posts: 2,627
Year: 1999
Coachwork: Thomas
Chassis: Saf-T-Liner MVP ER
Engine: Cummins 6CTA8.3 Mechanical MD3060
Rated Cap: 46 Coach Seats, 40 foot
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Quote:
Originally Posted by Jdawgsfanasty
[emoji23]...
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Found it
So it's hiding towards the transmission. I had to go in through the side access door and it is not easy to reach. Good to know it is there.
It has a filter fitted to the block directly above. Is THAT a fuel filter. The coolant and oil filters are on the other side.
Is the separator just a filter too?
I need to go check out the Cummins site a bit more. This engine is different to the last diesel I owned.
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01-16-2018, 11:34 AM
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#27
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Bus Geek
Join Date: Mar 2011
Location: Houston, Texas
Posts: 8,462
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
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I have heard of truckers keeping a piece of broom handle under their seat to aid in priming. The manual "pump" is often hard to get to and requires a LOT of pumps if the system goes dry.
Running a diesel empty is a whole different affair than running a gasser empty.
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01-16-2018, 11:36 AM
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#28
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Bus Nut
Join Date: Dec 2017
Posts: 973
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Quote:
Originally Posted by Tango
I have heard of truckers keeping a piece of broom handle under their seat to aid in priming. The manual "pump" is often hard to get to and requires a LOT of pumps if the system goes dry.
Running a diesel empty is a whole different affair than running a gasser empty.
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Never good
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01-16-2018, 12:50 PM
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#29
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Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 18,846
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
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the mechanical engines have primer pumps.. my DT360 has one.. and its come in handy for when I change my fuel and water separator filters..
the more im reading, it looks like there is supposed to be a hand primer on the 466E as well... the guys "adding them" are replacing them with newer ones.. some also have electric fuel pumps... grrr. seems like so many variances on these things.. the primer pump shows up in the units with spin-on filters. all the way back by the side of the engine back and down from the computer.. looks like a PITA to get to if its there let alone pump it
-Christopher
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01-16-2018, 01:13 PM
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#30
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Bus Nut
Join Date: Jul 2015
Location: Montana/Texas
Posts: 682
Year: 1998
Coachwork: Crown by Carpenter
Chassis: International 3800
Engine: 230 HP DT 466e/MT 643!
Rated Cap: 16
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There's a hand primer on my DT466e, but like you said, it's a PITA to get to and especially actually pump....last time I can get out fuel filters I had a helluva time getting the system primed...
John
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01-16-2018, 01:18 PM
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#31
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Bus Geek
Join Date: Mar 2011
Location: Houston, Texas
Posts: 8,462
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
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It is my understanding that many of the big rig mobile service units have a pump system that can be "plugged in" to facilitate re-priming an engine that has been run dry. Otherwise you can be there for quite a while and accomplish little beyond acquiring thumb cramps.
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01-16-2018, 01:22 PM
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#32
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Traveling
Join Date: Nov 2015
Location: Midwest
Posts: 2,573
Year: 2003
Coachwork: BlueBird
Chassis: TC2000
Engine: 5.9L Cummins
Rated Cap: '00
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Quote:
Originally Posted by Tango
I have heard of truckers keeping a piece of broom handle under their seat to aid in priming. The manual "pump" is often hard to get to and requires a LOT of pumps if the system goes dry.
Running a diesel empty is a whole different affair than running a gasser empty.
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Yeah, they can be a pita once the diesel gets cold and thickens a bit.
It can take 80- 100 pulses until button firms-up. Like sucking maple syrup through a 30' straw.
I just wanted to let people know that primer bulb might already be on there. It really is worthwhile to crawl over every inch of the bus and identify every single component. I snap a pic of whatever model/serial/manf. sticker is on it before it falls off.
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