fuel pressure

should there be pressure in fuel line when truck isnt running . changed fuel filter and there was no pressure in lines this is a throttle body injected engine . 88 sub 454

Yes there should be fuel pressure in the lines, even if the engine is not running. Fuel pressure should be 9-13 psi. Sounds like the check valve is leaking in the fuel pump.

Here is a site for testing fuel pressure:
http://www.autozone.com/az/cds/en_us/0900823d/80/08/73/10/0900823d80087310/repairInfoPages.htm

On my 90 K1500 with 5.7, there is never pressure in the line when I shut the engine off. I have verified this with a fuel pressure gauge. It has been this way since I bought the truck brand new 18 years ago.

//2000CAYukon

I stand corrected 2000CAYUKON, I should have done more research before answering. According to the online manual at the Olpin site:

Quote- The 220 TBI unit has a bleed in the pressure regulator to relieve pressure anytime the engine is shut off.

I stand corrected 2000CAYUKON, I should have done more research before answering. According to the online manual at the Olpin site:

Quote- The 220 TBI unit has a bleed in the pressure regulator to relieve pressure anytime the engine is shut off.

No worries tempfixit. The TBIs are very different from the Vortec engines and I happen to have owned one for quite a while.

Have a good one.

//2000CAYukon

truck runs fine just got back from 200 mile trip towing camper no problems thanks guys