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Only a slight chance of explosion, many shop vacs have brush type motors:oops:

They are not on the back of the truck, they are in front of, almost on top of the fuel tank, removing these are one of the first things just about everyone does because they are so problematic. Just do one at a time so you do not get the lines crossed.

When did they start installing the valves? Both my 92 and 93 had them, every other one I have worked on was newer and all had them.

Yes, I just wrap a red rag around the blow gun in the fuel fill pipe, that way I can only build 4-5PSI max which is all you need if the check valves have been removed, I would not even try it with the valves in place, too much pressure you can blow the vent line off the top of the tank. 30 psi...

You should have also replaced the filter

Have you removed the two check valves directly in front of the fuel tank? Also have you drained the tank and filled it with fresh fuel? Checked to make sure the fuel pickup sock is not plugged? Be careful if you decide to pressurize the fuel tank or blow back through the feed hose to the tank...