How do you adjust the fuel metering screw accurately on an injection pump? The pump and injectors are new, but mileage had not increased, remaining at 15 or so. I am wondering if I can do this myself or if it requires a Ford specialty tool set. The manual only shows a cutaway view of the pump with the screw labled, but offers no advice on setting it. I have heard that this adjustment can affect power vs economy, and I am curious if anyone has any experience with it. Thanks.

 

If your question is how to adjust the fuel metering screw "accurately", it is done on a Stanadyne flow test bench. If you want your mileage to go up you'll have to reduce the fuel rate which will also reduce your available power. If you adjust the fuel rate to give you more power you'll likely get a corresponding reduction in mileage.

 

Thanks for responding. Do Ford dealers have this bench or do I need to find a diesel shop to do it? I assume that the pump has to be removed to adjust it.

 

If you really want to give up some power for fuel economy, then you need to remove a small plate with two screws on the passenger side of the pump. Line up the mark on the crankshaft with the line on the indicator. There should be a 5/32 or so allen screw inside. If it is not there, then turn the engine one more complete turn, the pump turns 1/2 crankshaft speed. Once you find the screw, turn it counterclockwise to reduce the amount of fuel and turn it clockwise to increase the amount of fuel. Just the opposite of a carb. Only try one or two flats on the allen wrech at a time and test drive it. A little goes along way.

You don't need any fancy equipment if you can remember how much you turn it incase you want to put it back.



1986 F-250 6.9 diesel,4x4,XLT Lariat,Ex Cab, 8'bed,etc...

 

If you need step by step instructions or want more info, just drop a line at: compman55(No Email Addresses In Posts!)



1986 F-250 6.9 diesel,4x4,XLT Lariat,Ex Cab, 8'bed,etc...

 

Thank you for your help, I am heading out to try to adjust it. Maybe by running Stanadyne in it I can make up for the power loss, if not a Banks Stinger System is going on my Christmas list. Santa, don't fail me now... I will e-mail if I have trouble.