The fuel pump in my car was replaced in July 06 with a Master brand pump from Advance Auto Parts. Everything I buy from this place ends up being junk. I wanted the AC Delco pump, but the GM catalog is incorrect for the early H/C car fuel pumps.
There are two pumps used in this car, one is approximately 1.45 inches in diameter, and the other is 2 inches in diameter. The AC Delco catalog only lists the 1.45 inch pump for my car, while I need to find the larger one. I used the off brand pump since I assumed that GM discontinued the correct size pump. The 1.45 diameter pump is AC part number EP378. From what I can gather, this smaller size was used in most of the 92+ cars, particularly supercharged ones. On the earlier H cars, the small pump corresponds to fuel harness codes CPK and CPV. The large one, which I need, has harness codes CPL and CPU.
Searching the Delco catalog, I found the correct part number, EP318. Oddly, it is listed only for some 1986 and 1992 H and C body cars. I wonder if GM either doesn't know what they put in their own cars, or maybe they don't care.
Here is my problem. I would like to eventually install a supercharged 3800, of either series. I do not think the stock fuel pump, even new, could handle it. The supercharged cars all came with the smaller pump, which I believe is why some people can swap easily to a Walbro unit. Is there anything I can do? Maybe there is a pump that is the right size and puts out enough pressure for the supercharger, but I can't find it.
Sorry about the long post,