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Old 03-20-2007, 08:02 PM   #1
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Default Fuel pump making noise again

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.

2.00" pump

1.45" pump

Sorry about the long post,

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Old 03-21-2007, 12:10 AM   #2
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No help on the fuel pump, but I have found out the hard way that on my car all the parts I have bought for it are from the later cars. The way I heard it, due to the body change in 1992, some parts were phased into the 1991 models to make the transition smoother. My car was built late in the production run for 1990 models and has some 1991 parts, which are actually 1992 parts. The next time you get a part for your car, tell them it is for a 1991 model.

I also am not too impressed with Advance. They only recently started putting stores in this area, and I thought it may just be due to having new people. Based on my personal experience, O'Reilly is the best store in this area as far as knowledgeable people, low prices, and the quality of parts. I try to stay out of Auto Zone, they are a last resort only.

I hope this helps.
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