Bens87tr, I would recommend you upgrade to a 340 (10000269) pump vs the 307, as the 340 has a higher bypass rating than the 307.
A higher bypass rating is maditory on Turbo Buick applications that typically can see 60-70psi of fuel pressure under WOT.
Realistically, if you think about it, the piece of rubber FI hose that connects the hanger to the pump would also hinder a good ground. The pump has no metal to metal contact with the hanger other than the negative ground wire. The pump is basically suspended by the rubber hose and resting in it's rubber insulated hanger bushing on the bottom of the pump. So knowing that, I would think the best way to properly ground that hanger, would be to attach a ground from the sending unit/hanger, to the frame. Clamping a ground to the return line would serve this purpose nicely.
A couple of things that can lead to premature pump failure are,
- Clogged or collapsed fuel sock.
- Trash in the tank injested by the pump and or clogging the pumps internal mesh screen.
- Crimped feed line or return line, forcing the pump to work to harder than normal, leading to premature failure. This can be eleviated to some extent by using a 20 amp fuse vs a 30 amp fuse in your hot wire kit. This was something I learned from Weldon with their pumps and would only make sense that the fuse would pop first before internal damage was done to the pump due to over heating.
- Fuel slosh causing the pump to suck air (cavitate) leads to over heating and damaged motor. Solution, never race the car with less than 7-8 gallons in the tank. Always more than 1/2 tank for me.
- Clogged OEM fuel filter, puts strain on the pump, which can shorten it's life span.
Now, you couple all of these factors with 14 volts that we run under WOT, and you can see where the pump can be subject to premature failure. During my time at PTE, I can remember handling around 20 or so Walbro pump failures/returns. And believe me, getting them to replace a failed one was next to impossible. This was always handled by the vendor. Namely, PTE would eat the loss. Chalk it up to the price of doing business. Walbro has always been a hard company to deal with. Especially when trying to get an official catalog of part numbers that show applications. I know Rod and I spent the better part of two months, compiling info from our customers and putting together one, if not the best application guide I've ever seen for Walbro pumps. That was 3 years ago. It can still be downloaded from their site today.
Precision Turbo & Engine - Turbocharger, Intercooler, Fuel Injector, Performance Parts & more! under the download section. Yes, it's in their retail price sheet. The problem you run into is, most vendors do not tell you the official Walbro part numbers.
Good grounds are a very important thing with our cars. Something that most people tend to over look, and simply put faith in the factory grounds. This can be a bad thing. John Spina at Caspers Electronics has really done alot of homework for our cars with solving most of the wiring and grounding issues. With most cars' wiring being 21 years old, wiring in general is something that will need to be addressed sooner rather than later.
Hope this helps.
Patrick
