The fuel in a P30 works like this. Turn on the key. this triggers two items 1 the ECM and 2 the oil pressure switch. You need both to register to start the fuel pump. If you think your fuel pump is out try. Turn key and put ear to gas tank or a funnel in the filler neck to listen for the pump to start.

the fuel cut-off is a vacuum cut off which is mounted on the rear of the fuel injector. it has a brown vacuum hose attached to it. To check it after it is out you push the plunger in while holding your finger tightly on the vac port to see if it holds pressure. The replacement part is a "BOSCH" #1427133091 for around $100.
3499 posts · Joined 2012. #3 · Dec 9, 2012. The voltage drop is from the relay that runs the liftpump I think. As for the fuel cuttoff. Yes they do have this feature. But with costly results. Too much fuel pressure ussually over 25 psi the VP-44 it can lockup. That's where it will cost you $800-1500 for a new VP-44 .
The GMC fuel shut off switch location is on the toe-board, to the right of the transmission hump, in the passenger-side footwell. Vehicle parts will eventually become ineffective. The fuel filter needs to be replaced every 30,000 miles or so. If it doesn't get changed, You will come across issues with the performance Having the fuel burn greatly is the key to maximizing Your miles per gallon
The release cable is sticking or broken. To release the fuel door, open the trunk and pull off the fabric liner on the left side of the trunk. Behind this liner is the fuel door release cable; this cable leads to the fuel door and attaches with a twist-lock connector. It is cylindrical with two tabs. Twist the connector clockwise about 90 My jaguars its stoped. Look inside your trunk and there will be an opening cut in the side of the carpet. This will have a air suspension switch and a Inertia safety switch. The Inertia switch controls the fuel pump in case you get bumped or crash. Push the button on it for 3 seconds to reset this safety switch. U5gTpY1.
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    • fuel cut off switch location