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Old 09-25-2005, 08:56 AM   #1 (permalink)
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Turn up the fuel on a 400 cummins

I have recently purchased a 1986 International 18 wheeler with a 400 cummins diesel engine for a farm truck. We are moving heavy equipment and like always need a little more horsepower. Does anyone no how to turn the fuel UP on these manuel engines? I have heard that it is fairly easy. Could some one explain how to do this. Any help would be greatly appreciated. Thanks in advance.
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Old 09-25-2005, 03:15 PM   #2 (permalink)
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Re: Turn up the fuel on a 400 cummins

Give these guys a call. They are the Cummins masters!!!

http://www.dieselinjection.net/frames.html
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Old 09-25-2005, 03:45 PM   #3 (permalink)
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Re: Turn up the fuel on a 400 cummins

Simplest/ most bang for your buck would be to swap out the button, going "smaller" recess for added power. They are listed according to the size of same recess, your engine vintage stock might be 40 - 50 I'm guessing. Buy one from an amiable fuel shop, as small as you feel confident in your engine and your disipline in not melting her down (5-10 is pretty snappy).
To locate, view your PT fuel pump from the drivers side, the idle adjustment cover is needing to be removed. It is a conical 4 bolt mounted cover on the rear side (opposite mounting driven side) with a small 1/8 pipe plug on the end. Remove this cover and carefully extract an internal snap ring from a sleeve just within the area previously covered. Some spring pressure will loose the parts if you don't pay attention. Remove the snap ring, spring and retainer. The fuel button is within and can be easily swapped, you'll see what to do.
The smaller recess presents less of a surface for internal fuel pressure to act apon, more is required before the button shifts and regulates. Higher pressure means more fuel/ power. (PT stands for "pressure - time" and was always Cummins claim to injection fame).
Lorne [img]/ubbthreads/images/graemlins/grin.gif[/img]
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Old 10-01-2005, 06:25 PM   #4 (permalink)
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Re: Turn up the fuel on a 400 cummins

Thanks for the input guys. i changed the button and adjusted on the pump itself and now pushing 480hp with a very quick response from the engine. Much better. Once again, Thanks to you guys and a local cummins pro.
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B&W Turnover gooseneck ball hitch and five leaf overload pack added.
4" Exhaust, SCT tunner running the 65hp heavy tow tune!
New headgaskets, head and valve job, ARP Studs, Injectors replaced, Upgraded oil tubes, EGR Delete, New oil cooler, New manifolds, Blue spring fuel pressure kit, new 850 batteries, and ScanGaugeII.
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Old 03-23-2009, 03:28 PM   #5 (permalink)
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Hey bud. where did you get the button from? i just bought a 77 pete cabover and it has a 400 cummins in it and looking for some more power.
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