It's an electric pump, just more HD. Often used in HD truck applications and diesel boats. The OEM pump you have now is a a rotary-high-speed electric pump. The Walbro is a low-speed diaphram-type pump. I know it's been tested for endurance and greatly outlasts the rotary pumps. It is rated for a life of 18,000 hours under constant running, and it does not run all the time in a car or truck. That equates to around 1,000,000 road miles. Also has a removeable fuel-screen in it. I paid $130 for the last one I got.
http://www.fuel-pumps.net/frb51.html
I'm not saying the pump is your problem, though. When you get air at the filter, it means your pump is sucking air from somewhere. A bad pump can suck air from itself, and a questionable pump can work OK until the intake line or strainer gets plugged - and that pump will leak and draw air.
If you live in a winter-road-salt area, you might have a broken or rusted intake line on top of the fuel-tank.
I've got a 92 diesel Suburban sitting here that pumps air no matter what I do - if I use the fuel tank that's in it. I'm stripping it anyway, so I stuck a 5 gallon out-board motor tank in the back, and have it hooked with a rubber hose to the engine. Runs fine that way. Obviously there is break or rust-hole in the intake line on top of the tank somewhere.
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