Greasy Fuel Pin

[IRoss]

Thats right, when I took apart my AFC today to give the starwheel another half spin I noticed a big greasy stain from where the fuel pin is contacting the eccentric... . this is relatively new, I had it apart last weekend, and it was clean... . Is there a seal in there i might have screwed by pulling out the diaphram off-center? I also adjusted the full fuel screw when I pulled the diaphram last time, would this have increased the pressure inside the pump enough to blow fuel in there? I'm about to go on a bit of a drive this weekend, should I be worried? Thanks,

ian

 

[Greenleaf]

Drink a cold Mt Dew and enjoy your ride. There is supposed to be a film of grease in there. It IS grease and not fuel, right? You will not muck anything up by turning the fuel screw and messing around with the AFC under NORMAL situations. If you try to get the fuel control pin O ring to leak you can, but you'd have to abuse it.



You'd know if you have #2 running out the AFC air vent.

 

[Don Tanklage]

You will not muck anything up by turning the fuel screw and messing around with the AFC under NORMAL situations.

gl, have you ever heard of idle issues after the fuel screw has been turned in and then turned back out? i think it was joe donnelly that told me he had turned his in and later turned it back out but that there were idle issues when he turned it back out. mine was kinda acting up when i had it turned back out too, but i always try to set my idle at 600 with no load and maybe that is just too low. whatcha think?



thanks, don

 

[MMeier]

When mine was idling at 600, it just didn't sound right, I now have it so it is at about 725 with the air on and ambient below 100*. Seems to lower a bit in hot weather by itself.

 

[Don Tanklage]

maybe my tack is off? dunno... i love the way mine sounds at 600! but you are right, if i drive to a hotter climate it will drop a little and not sound right. its funny, but with the fuel maxed the truck is so much quieter than it is with the stock settings. then you adj the valves and it is even smoother...



yea, i am sure if i idled it as high as you are saying i wouldnt have any issues, no matter where the fuel screw is



sorry to of hijacked the thread

 

[Greenleaf]

600 is simply too low. 800 is more like what it had "otta" be. You are right that the engine slows in idle speed when hot and especially in hot weather. Then the A/C is turned on. My engine will operate about 650 when hot,A/C on and in "Drive"



No problems encountered with messing with a fuel screw other than potential run-a-way.

 

[Don Tanklage]

what is different in a non ic pump? i hear you can create a run away condition with those pumps but not with the ic pumps

 

[Greenleaf]

The governor lever/spring assy is different between the two. The ones with autos would have a tighter (stiffer) spring. Outside of that, I belive they be alike.



Both will run-a-way just as easily as the other. I know, I have both pumps.

 

[Don Tanklage]

really???? then my pump is dust. i have the screw turned in until it starts to get tight. i was told not to try to force it or damage would occur. so i think it is all the way in (and no run away condition). whatcha think?



don

 

[Greenleaf]

I had one do just that. The screw was tight and it operats fine. I worked with it for some time. It was highly modified and could never get it to run off. He is still driving it. It's in a 1993 4X4 getrag.

 

[NYCEGUY01]

My 93 pump is like that. Screw it in all the way till it stops and no runaway.

On a side note I noticed that if I back it out a 1/2 turn or so the truck will pick up a few more hundred rpm at wot. I was a little dissapointed with the 366 spring and it was somehow solved when I backed out the screw a little ?

 

[therabbittree]

when you guys say turn it in till it stops are you talking about the fuel screw stock with the locking collar still on it preventing it from turning in all the way ???? or with it modified ... ie collar removed and threads cleaned up so fuel screw can turn in way FAR. . ie past teh stock collar location?. . all of mine are collar removed and if screwed too far in the engine runs away. . if you screwed it all the way in, it would go WOT at start and nothing but the fuel shutdown lever will slow it ha. .

Later

Deo

 

[Don Tanklage]

fuel screw

mine looks just like pb's did, cept it only has the one lock nut on it



is the nut with a 10mm head what you are talking about?



or what 'shoulder"?

 

[Don Tanklage]

i see what you are talking about...



mine musta had the 'stop' removed when i got the truck



it will not run away with the screw bottomed out



if you eye-ball it the exposed threads of my fuel screw (sticking out of the back of the pump) end flush with the back side of the banjo (return banjo)



can you picture it? or do you want to see it? i think i have a pic. screwing the screw in that far (as far as i could get it to go) raised the idle from 600 to 900 rpm, if i remember correctly



don



ps - you can see it in the pic i took for the afc line

 

[Greenleaf]

when you guys say turn it in till it stops are you talking about the fuel screw stock with the locking collar still on it preventing it from turning in all the way ???? or with it modified ... ie collar removed and threads cleaned up so fuel screw can turn in way FAR.

Later

Deo

Deo... .come on now. What good are pump adjustments with the locking collar still in place?

 

[Don Tanklage]

i think there is more to it than just removing the colar...



has something to do with the shape of the end of the fuel screw

 

[therabbittree]

Green Leaf Thats what I was thinking If your not removing the spot welded collar your not really adjusting the full fuel screw. . the other set screws are just lever stops any how... they do nothing for you ... my max screw is basically gone. . ha

Later,

deo

 

[Don Tanklage]

my max screw is in scrap bin



idle screw is too



the issue was not stopping the travel, it was getting it...