I have wonna them Edelbrock fuel pumps on my 63 Nova with 355 V8. I kept having fuel leaks and couldn't figure out where they were coming from. This spring I fired it up and fuel was streaming out of the airhorn gasket (it's an Edelbrock 600 cfm carb) just as if the needle valve(s) were stuck open. Just for the heck of it, I decided to try something different. I had a Demon 750 carb sittin on the shelf, so I put that on. First, I'd never tried the carb and didn't know if it would work. Second, I wanted to see about the leaking thing.
The Demon carb leaked from the rear float bowl, too. After some head scratching, I got an el cheapo fuel pressure regulator and slapped it in the line right in front of the carb. I set it to about 4.5 psi and "Viola!" Neither carb leaked. I took the Edelbrock apart and made sure the needle valves weren't gummed up (they may have been slightly sticky) and it's back on the car now and runs fine. And no more leaks. Ohh....the Demon worked fine, although it was jetted too rich for the 355. I'll run it on the AFR-head, roller-cam 406 in my 85 Monte Carlo when I get it fired up.
It seems that E-brock pump was putting out too much pressure for either carb to handle. In fairness, I think there are 2 versions of that pump. One is high presure, the other one is low pressure. I got this one from a "friend of a friend" and I don't know which one it is. It might be that it's supposed to put out 12 psi...but that's way too much for an AFB (and apparently for the Demon) carb to handle.
So I think I'll just stick with stock pumps from now on unless it's for a race motor with a requirement for lotsa fuel...and then I'll run a regulator and gauge.
One other thing on the E-brock fuel pump. If I let that car sit for a week or so without running it, the carb drains completely and requires a lotta cranking (and maybe some starting fluid) to get it fired up. I dunno if this is common to the Edelbrock pumps or not. I'd swap it out with a stock pump, but it's so close to the front crossmember that it's a real bear to change. And I have plenty of other projects to keep me occupied.
