How To Turn Up The Fuel Delivery On A 6.2L Diesel

We show you how to tear apart and turn the screw to adjust the fuel system on a 6.2L Diesel. Warning: turning the fuel adjustment screw can result in engine damage.

[wmclassics]

I have an '85 suburban with it's original 6.2, this oilburner has had a banks turbo on it half it's life...irony is that this beast starts better cold than warm, but other than that runs like a dream.

[gizmothewytchdoktor-]

b4 attempting any of this make damed sure that the surrounding area is as clean as possible. saw chunks of dirt left in the bowl and thats not going to fly once even a small piece hits an injector. with fuel feed change timing also has to be reset. otherwise there will be a power drop instead of a gain.

[mattlf]

If your pump is newer it should have an irregular polygon(home plate) shaped timing mark cover.
Remove this cover and rotate the engine until the allen head screw appears.
Carefully turn this screw clockwise for more juice or counter clockwise for economy.
Just a 1/2 turn of the screw will allow it to deliver more fuel than your idi can burn unless you have a turbo.

[shanerobinson]

ether then rev a cold diesel...   real smart.

[celloprof]

We always turned it up 1/4turn for the 6.2 diesels with a turbo and no more than 1/8th with non turbo. At any rate, the engine has to be re-timed after the screw is turned. Oh and on one of our 6.2's it didnt run bad at all being 1/4turned with the turbo off, but that was only temporary.

[VeggiePower]

You can get even more power if you completely remove the limiter.
You can get about 300 Hp out of a 4911 pump with Turbo.
But you have to take the distributor head out of the pump, so it's more work.

[jessesmithworkshop]

Hello, I have been having an issue on my 6.2 where I start it up and it idles ok until I tap thr throttle and it revs up like an extra 500 rpm I first thought this was my throttle cable because it seemed like the cable was sticking. What else could cause this? Faulty high idle solenoid??

[keithjurena]

No need to take the top cover off. There is a three screw cover on the side which gives access to the screw. This screw affixes the plunger shoe leaf spring. Tightening it forces the spring flatter, this increases maximum plunger stroke. At other throttle positions, the metering valve controls how much stroke the plungers make.

[blackula]

Definitely not a 72. And someone was chanting to spray ether down the engine towards the end to start it. Bad idea.

[juansoto]

Is there a way to find out if your adjustment screw has been turned up yet?

[robertadamovski]

Hi there:)
I have a Chevrolet Blazer 6.2l 1986.
So here is my problem:
When i start the engine, it runs normally for half a minute, and then the engine turns off, and you can’t start the car for about 15 mins.The cycle is repeating over and over .
Could it be some problem related with this one(depicted in your video)?

Cheers,
Robert

[ulfpetersson]

I have an gm8 turbo on my 6.2 and have been done like this video.
I have turned 1/2 (from 12 to 6) and still don't get any smoke and just about 5psi of boost.
Anny suggestions?

[richardclark]

I need help ....I have not
done this but I have put a fuel filter and pump on my truck and it still won't stay running please help

[skeeterskeet]

The 72 never had a 6.2. However the 6.2 was built to drop into any small block gas engine’s Motor mounts. So it very well could be done.

[KS-olrz]

I touched my screw and my trucks running awfull and knocking I moved it back and still haveing issues any idea?

[WoodyHertzogIII]

Had to watch this a few times. Maybe this was a first time video. Guy holding camera needs to chill out and hold it still. Normally wouldn't comment on someone doing something nice and sharing but criminy! Anyway, will do this to an 83 gmc diesel I have and share results unless someone on this board talks me out of it. Only 1/8 turn. But a boost in power would be nice. The truck itself runs like a gem. Sounds brand new still. Amazing truck!

At end of video, started truck but you didn't run truck BEFORE adjustment so nothing to compare. Also NO conclusion on video. Results?

[bleachinuri]

it think he means an 82, 82 was the first year for the 6.2

[carlsapartments]

"1972 Chev Scottsdale 6.2 diesel"? I don't think so, it doesn't exist unless you created one!

[wmclassics]

Even towing the boat, never run the egt over 900...specs say the engine can handle 1100 before things start going bad...but i see no reason to chance it if all i have to do is drop out of OD or back off the pedal!   Not like the fish are gonna go anywhere!

[scorpiocat]

CLOCK Wise or COUNTER (CCW)...so which way is it? Inquiring minds wanna know.LOL!