* Under the hood in the fuse box: This is the most common location. The fuse box itself might be located near the battery or on the driver's side fender. The relay may be labeled, or you might need to consult your owner's manual or a wiring diagram to identify it.
* Under the dash: Less common, but some models placed it in a fuse block under the dashboard.
* On the chassis near the fuel pump (rare): While less likely, it's *possible* in some configurations that it's mounted directly to the chassis near the fuel tank, but this is not typical for this vehicle year.
To find it, I strongly recommend:
1. Consult your owner's manual: This is the best place to start. It will have a diagram of the fuse box and relay locations specific to your van.
2. Use a wiring diagram: A wiring diagram specific to your 1990 Chevy G20 van will clearly show the location and color codes of the fuel pump relay. You can usually find these online through automotive repair resources or parts websites.
3. Check online forums: Searching for "1990 Chevy G20 fuel pump relay location" on forums dedicated to Chevy vans might yield helpful information from other owners who have already tackled this task.
Caution: Working with automotive electrical systems can be dangerous. If you're not comfortable working with electricity, it's best to take your van to a qualified mechanic.
