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Thread Details Posted by cumminsdude2001, this thread has received 25 replies and been viewed 13240 times.

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Old 03-30-2009, 11:54 PM   #1
cumminsdude2001
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Mack EM6 Engines 300 and 350

How to you turn the fuel up on thease injection pumps? They are set different, not the p-pump like in the EM7 engines. Thease mack trucks with thease injection pumps are in the 1980's. The only thing I know how to do is shim the puff limiter. Anyone know how to turn the fuel rate up on thease pumps?
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Old 04-04-2009, 12:05 AM   #2
nevrenufhp
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Wish I knew. Maybe if you had a pic of it, it may jog someone's memory.
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my daily driver:67 F100, 300 4V, cammed, 4 spd.
or, 98 Jetta VR6.
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Old 04-04-2009, 02:36 AM   #3
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Quote:
Originally Posted by cumminsdude2001 View Post
How to you turn the fuel up on thease injection pumps? They are set different, not the p-pump like in the EM7 engines. Thease mack trucks with thease injection pumps are in the 1980's. The only thing I know how to do is shim the puff limiter. Anyone know how to turn the fuel rate up on thease pumps?
Yup remove the six bolt cover at the top back of the pump!
You'll find a stop with two jam nuts 1/2 inch wrench size!Loosen the the back one three or four flats of the nut and tighten the front one reinstall the lid and try it!giver a little more if ya need a little more!don't exceed 1150 0n the pyro if you don't got no pyro, get one!Ya want to end up making about 22 - 25 psi boost!Don't got no boost gauge? Get one!
If ya need More info on this post over here http://www.bigmacktrucks.com and Lmackatack has a write up with pics that should straighten ya right out!

Last edited by fjh; 04-04-2009 at 02:44 AM.
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Old 04-04-2009, 05:49 AM   #4
Lmackattack
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check this thread out... I made a write up after FJH walked me thru it
http://www.thedieselgarage.com/forum...417#post442417
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OH...AND A FEW TWISTS OF THE FUEL SCREWS ....THANKS AGAIN... FJH!
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Old 04-04-2009, 11:48 PM   #5
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check this thread out... I made a write up after FJH walked me thru it
http://www.thedieselgarage.com/forum...417#post442417
thanx bro!
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Old 04-08-2009, 08:20 PM   #6
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Man, where was this forum 10 yrs ago when I was driving a one stack Mack with a window in the back...
Mine was a dog. It would howl at night....
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Old 04-09-2009, 01:33 AM   #7
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fjh not what to change the subject but can you tell me what the O/D is on a T2090? And also the flywheel teeth count on a E6 would it be 118? thanks glenn
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Old 04-09-2009, 03:02 AM   #8
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0.71 in top gear for the 2090 and 2090B

the 2050 2060 2070 had 0.60 in top gear...some of the "fastest" class 8 transmissons built but put in the slowest trucks made !
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2 STICK 6 SPEED, 4.17 REARS ON 34K CAMELBACK SPRINGS,206"WB, 4" STRAIGHT STACKS BLOWING BLACK,

OH...AND A FEW TWISTS OF THE FUEL SCREWS ....THANKS AGAIN... FJH!

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Old 04-09-2009, 06:42 PM   #9
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Had something to due with the 7.50 gears out back? !
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Old 04-10-2009, 12:24 AM   #10
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fjh not what to change the subject but can you tell me what the O/D is on a T2090? And also the flywheel teeth count on a E6 would it be 118? thanks glenn
My goosh Glenn you ask complicated questions! I have never sat down and counted the teeth on a flywheel on anything Ever! The OD thing I try not to clutter my mind with them kind of facts,There is to much Rubish coming down the pipe to store info like that for me!This EGR trash has amoust taken the place of all the old info ,Kinda like pushing marbles in a tube, sooner or later one goes in one comes out! Dam I had to pass off turning up a fuel Pump to one of my students Trent.Thats how bad its getting!
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