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Turning Up Disel Pump(Fuel)

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Turning Up Disel Pump(Fuel)

Postby kingman » Tue Feb 16, 2010 11:07 pm

Turning Up Disel Pump(Fuel)

Can anyone direct me as to how this is done and support this with some pics please?

I believe this is a special mod I would like to do,yet I cannot see exactly where this would be done.
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Re: Turning Up Disel Pump(Fuel)

Postby wbski007 » Thu Feb 18, 2010 12:35 am

Fuel adjustment screw is on back side of your injection pump, it will have a green tin cover over it that you must remove , then you'l see a sloted screw with a 12mm nut locking it in place ,loosen nut while holding screw with commom screw driver, once nut is loosened turn in screw one full turn and then tighten lock nut while holding screw in place, one turn should do it, then take for ride and check that you don't have too much smoke , if so just repeat procidure only back of screw a little. Take it for a ride first and see how much smoke it produces at full throtle and use that as a guide line on how much it changes after you turn it up.
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Re: Turning Up Disel Pump(Fuel)

Postby cyberbeej » Tue Feb 23, 2010 12:18 am

looking for a bit of advice now that i know where to locate the fuel screw.

been reading through the forum and found info on turning up fuel to match a rise in boost pressure from 10psi standard to 15 psi.
my question is, can anyone suggest how much to turn the srcew as a starting point for fine tuning?

Oh, i drive a UK trooper 3.1 TD 1997, if this helps.

thanks in advance. BJ
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Re: Turning Up Disel Pump(Fuel)

Postby wbski007 » Tue Feb 23, 2010 3:15 am

I start off with one full turn, that's usually enough, like I said up top, take it for a ride before you do any adjustments and see how much black smoke your putting out at full throttle, if any, then do the one full turn and check again, you don't want tons of black smoke, as you'll be just wasting fuel and not gaining any more power, remember black smoke is unburnt fuel!
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1949 Dodge 2 1/2 ton pumper fire truck, 15,000 original miles, with a 1991 Cummins 5.9 diesel, turned up fuel, 5 speed trans, two speed rear, also added P/S, P/B.

Re: Turning Up Disel Pump(Fuel)

Postby cyberbeej » Tue Feb 23, 2010 3:38 am

my ride doesn't make any black smoke, is it just running well then?
so turn till black smoke then back off a quarter turn, does that sound about right?
thanks wayne
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Re: Turning Up Disel Pump(Fuel)

Postby geeves » Tue Feb 23, 2010 4:49 am

96 and 97 are probably electronic control. Limits the choises
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Turning Up Disel Pump(Fuel)

Postby cyberbeej » Tue Feb 23, 2010 5:26 am

If its electronicly controlled, if i tweak the boost will it compensate automaticly?

what are the limits? its the same as the pictue above with something electric attached, what is this bit?
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Re: Turning Up Disel Pump(Fuel)

Postby wbski007 » Tue Feb 23, 2010 8:42 am

A little black smoke at full throttle is OK cybereej, you just don't want a whole lot of it.
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1949 Dodge 2 1/2 ton pumper fire truck, 15,000 original miles, with a 1991 Cummins 5.9 diesel, turned up fuel, 5 speed trans, two speed rear, also added P/S, P/B.

Re: Turning Up Disel Pump(Fuel)

Postby scruff123 » Tue Feb 23, 2010 12:01 pm

my 95 bighorn 3.1 is electronically controlled and turning up the boost doesnt make any difference, so it mustnt be able to compensate higher than standard settings, have to take it in to the dyno tuners for it to be done properly. its running 12 standard, what about yours?

also i couldnt find any fuel adjustment screw anywere, dont think they have one
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Re: Turning Up Disel Pump(Fuel)

Postby geeves » Tue Feb 23, 2010 1:14 pm

they do Its under a cap. Increasing the fuel on that engine though also increases the idle speed
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Turning Up Disel Pump(Fuel)

Postby cyberbeej » Wed Feb 24, 2010 5:22 am

can understand what you guys are saying about the bighorn but my trooper has a thumb throttle so idle isnt a problem.
i found the fuel screw and gonna measure the boost pressure and see what it measures, thought its ment to be 10psi standard or is the bighorn different? where is best to take boost gauge from?
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Re: Turning Up Disel Pump(Fuel)

Postby scruff123 » Wed Feb 24, 2010 6:44 pm

geeves wrote:they do Its under a cap. Increasing the fuel on that engine though also increases the idle speed


can anyone tell me were it is in these photoes? cant find any cap or screw??

P2242510.JPG

P2242511.JPG
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Re: Turning Up Disel Pump(Fuel)

Postby wbski007 » Fri Feb 26, 2010 7:23 am

WOW I can't see any fuel adjustment screw on your pump but there should be one somewhere, how about it Geeves you see one anywhere?? That might be it on the upper left of the bottom photo, its under a yellowish tin cap. Your pump is way differant than mine.
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1949 Dodge 2 1/2 ton pumper fire truck, 15,000 original miles, with a 1991 Cummins 5.9 diesel, turned up fuel, 5 speed trans, two speed rear, also added P/S, P/B.

Re: Turning Up Disel Pump(Fuel)

Postby geeves » Fri Feb 26, 2010 2:44 pm

everyone expects too much of me. A lot of things are from memory from what others have written and this is one of those. Ive never actually touched a pump.
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Turning Up Disel Pump(Fuel)

Postby chrisfnq » Fri Feb 26, 2010 4:12 pm

geeves we dont expect too much from you..
you are for isuzu what the stig is for top gear...lol
And i cant find an adjustment screw on my pump either...lol
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Re: Turning Up Disel Pump(Fuel)

Postby ecw23able » Mon Oct 03, 2016 11:52 am

If your pump is like mine the adjustment screw is too left out of camera shot of the bottom pic. Under a cover. Careful not to bend the cover pulling it off I ficked mine totally.
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Re: Turning Up Disel Pump(Fuel)

Postby cocholi » Thu Oct 06, 2016 8:44 pm

you don't ser the fuel adjustment screw because your pump is electronically, adjustment screw is for mechanical pump
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Re: Turning Up Disel Pump(Fuel)

Postby geeves » Fri Oct 07, 2016 4:40 am

93 Mu is very likely only mechanical injection
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Turning Up Disel Pump(Fuel)

Postby DieselElectric » Sat Oct 08, 2016 10:31 pm

scruff123 wrote:
geeves wrote:they do Its under a cap. Increasing the fuel on that engine though also increases the idle speed


can anyone tell me were it is in these photoes? cant find any cap or screw??

P2242510.JPG

P2242511.JPG


This type of injection pump uses an electronic governor (COVEC-F) and is controlled by a computer elsewhere in the vehcle ie. no simple external adjustment. To adjust fueling on this pump it SHOULD be done professionally however, it can be adjusted by loosening (NOT REMOVING!!!) the four screws on the top (governor) and tapping it forward or backward with a hammer and a punch. BEWARE: If you choose to attempt this adjustment and botch it your engine may not start or, it will start then idle high and take off on the slightest touch of the throttle.
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