Re: Adjusting an updraft Detroit Lubricator

Posted by 32model901 On 2018/4/22 20:11:51

Adjusting the fuel level is one important area that will help the DL function properly. Checking to make sure the arms that connect the air box vanes to the main jet are not worn excessively is another.

Fuel level can be checked with the DL off the car. I've found it easier to do it this way, vs. on car adjustments. Fuel pressure should be the same as what will be supplied by the mechanical or electric pump.

Original Stewart Warner fuel pumps will typically supply 1.5 to 2.0 psi. Electric pumps are typically higher.

Instead of using gasoline, I've used mineral spirits as a test fluid, safer that gasoline.

Most DL's have a drain fitting on the bottom of the bowl casting. I've made up a fitting to screw into this after removing the drain fitting. The fitting is drilled thru with a small diameter piece of clear hose attached to it. Leave the free end open and make sure the end of it is higher than the top of the bowl and firmly secured so it will not drop down.

If you turn over the engine or start the electric fuel pump you can check to make sure the fuel level in the bowl is correct by measuring the distance between the fuel in the clear hose and the top of the float bowl.