# Proper Procedure for Relieving Fuel Pressure - 90 Cadillac Deville **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** cadillac\ **Created:** [October 11, 2018, 11:37pm UTC](https://community.cartalk.com/t/proper-procedure-for-relieving-fuel-pressure-90-cadillac-deville/126602 "2018-10-11T23:37:16Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Kelly\_Marchewa](https://avatars.discourse-cdn.com/v4/letter/k/d9b06d/32.png) [@Kelly\_Marchewa](https://community.cartalk.com/u/Kelly_Marchewa)\ **Post date:** [October 11, 2018, 11:37pm UTC](https://community.cartalk.com/t/proper-procedure-for-relieving-fuel-pressure-90-cadillac-deville/126602/1 "2018-10-11T23:37:16Z")
Greetings: In order to diagnose/repair an issue with my sister’s 1990 Cadillac Deville, it is likely that I will need to relieve the fuel pressure (it is fuel injected). However, I have a question about how to properly do so. In my 1996 Chevy Van (also fuel injected), I was able to relieve the fuel pressure properly by pulling the relay and attempting to start it. However, in the repair manual for the Cadillac (Chilton or Haynes, I cannot recall), it says one should remove the pressure by bleeding it, presumably at the Schrader valve. I am curious if pulling the relay would work on this vehicle, and if so why not? I am more comfortable with pulling the relay than bleeding the valve (I am afraid of making a mess or not relieving the pressure enough), so it would be preferable if I could take that approach. Thanks. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [October 11, 2018, 11:45pm UTC](https://community.cartalk.com/t/proper-procedure-for-relieving-fuel-pressure-90-cadillac-deville/126602/2 "2018-10-11T23:45:59Z")
If you let the vehicle sit for a half hour, the residual fuel pressure will bleed off so there is no fuel pressure. Tester