http://www.biofuelstechnologies.com/...ead.php?t=5730 that is how to check pressure switch. Is your fuel pressure steady on diesel? If so gauge should be good. When it reads 25 psi get out with truck running as see if diesel pump is running by putting your hand on it. You can feel it running. Contact me at
dave@veggiegarage.com. I am getting a little tired of the lame non helping answers people are posting. So lets go private for now.