You mean when you unhook the line to put the gauge in line? Yeah, you will need a towel or rags. Once the existing pressure bleeds off it will stop. Clearly get everything hooked up with the key off so you don't have the pump creating pressure while you are trying to get it hooked up. You will not get much fuel out of the line but there will be some when you unhook it.
Then once everything is hooked up, cycle the key a few times to get the pump to build the pressure and prime the line and check for leaks. If there are no leaks, go ahead and start you pressure checking.
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Saturday, March 21st, 2020 AT 7:33 AM