Checking rail pressure while cranking

[Konstantin]

(11-11-2019 )Lonestar10 Wrote:  could be a deadspot in the sensor that it moves into and goes limp. biggest thing is that the elec is pumping fuel and that fuel pressure skyrockets above 200PSI as soon as you hit the key which means the gear pump is good. the pressure sensor is on bottom of the IFSM looks just like the exhaust back pressure sensor. its on the bottom left side just to left of fuel filter.

thanks, no it is not sensor I measured with the gauge. it also changes sound at the same time when it looses 10 psi pressure and goes to 0. I think maybe it is normal operation, or maybe pump is going out or I should have installed new gasket... In order to remove priming pump I removed a lot of stuff around it. I want to finish repair before putting everything back together.