I have the high volume Edebrock mech pump. I have mixed reviews of it to date. It was on my engine for about two years and failed causing me to call a rollback wrecker to haul it home. Luckily when I purchased it I also purchased an overhaul kit. Once home I pulled the pump and installed the overhaul kit. So far it has been working fine, but if it fails again I will be going the electric pump route. In the day these Carter style mech pumps were bullet proof and never failed. I had one that was transfered to three engines and was still going strong when I sold the car. I do not know what has changed, but I have a sneaking suspicion it's cut rate parts.