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Date:         Sat, 2 Oct 2004 15:55:19 -0400
Reply-To:     Greg Potts <Greg@POTTSFAMILY.CA>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Greg Potts <Greg@POTTSFAMILY.CA>
Subject:      Re: Substitute Fuel Pump #
Comments: To: Al and Sue Brase <albeeee@MCHSI.COM>
In-Reply-To:  <415F00CB.8040702@mchsi.com>
Content-Type: text/plain; charset=US-ASCII; format=flowed

Hi Al,

Upstream of the fuel pump is a filter, and that filter has the same smaller inlet that the aftermarket pump has. So twhen we swapped the pump on Dad's vanagon westy we still had plenty of fuel flow.

In any case, fuel delivery is controlled by the fuel pressure regulator, not by the fuel pump. As long as the gallons per hour and pressure are equivalent then the total fuel volume will be adequate, since the fuel pressure regulator bleeds off fuel as soon as the pressure in the rail reaches 35 PSI and the excess fuel is returned to the tank. If the Bronco/Ranger pump was designed for a 2.9L engine I'm sure that it would be up to the task.

Happy trails,

Greg Potts Toronto, Ontario, Canada

1973/74/79 Westfakia Conversion **Bob the Tomato** LY3H 1977 Sunroof Automatic L63H/L90D http://www.pottsfamily.ca/westfakia http://www.busesofthecorn.com

On 2-Oct-04, at 3:26 PM, Al and Sue Brase wrote:

> That cheap one is probably a Facet, which makes around 5 psi, whic is > only suitable for carbs. What you need is a rotary (Vane, I think) > pump, > with a LOT more pressure and volume. It has to be able to maintain this > pressure while still delivering enough flow to the injectors. Otherwise > the engine will run lean. Even the Bronco/ Ranger pump will probably > deliver less with the smaller inlet. I think the inlet hose is a couple > of mm bigger like 12 or 13mm. > I don't know about others, but my right foot spends quite a bit of time > flat on the floor. Not to cruise, but to climb hills and pass. I don't > want it running lean and have that extra air in there looking to > combine > with the piston tops ar the cylinder heads. > I'd consider it a limp home option, not a preferred fix. There are a > lot of good used ones out there. > Al Brase > Vanagons > > Mark Edwards wrote: > >>> I have been using a fuel pump for one of the Ford Bronco/Ranger >>> vehicles that has a Bosch look-alike fuel injection system much like >>> our >>> Vanagons. The NAPA part # is 2P74028, and the price is around >>> $60.00. >>> >>> >> >> >> I looked this up on the NAPA site and the very brief specs say it is >> 30-40 >> GPH and the pressure is 4-6 >> >> I then checked on an 89 Bronco with 2.9l and the only ones I found >> were >> the in-tank variety, but they were rated at a pressure of 40 >> >> Looking up the pump for a Vanagon, got several choices, all of which >> were >> in the 30-40 GPH range, but the pressure varied from 2.5-4.5 all the >> way >> up to 73, which is certainly higher than most pumps I came across for >> a >> variety of vehicles. Do all Vanangon pumps need that much pressure? >> >> I also came across a "universal" pump listed under Vanagon, that is >> not >> the cylinder shape of our pumps, but it was an odd looking square >> part. >> The number is BK 6101051 rated at 30 GPH and 2.5 - 4.5 pressure, and >> only >> $35..... >> >> Now, I am not about to use this on my van as the full time pump, but >> what >> about having it as a spare? Does a pressure rating of 2.5-4.5 fit any >> minimum spec for the vanagon? >> >> The mount is totally different, but a little work up front with some >> pre-drilled holes, would allow it to be hung down there in the event >> of an >> emergency. >> >> Anyway, why the difference in pressure specs? Does it really matter, >> and >> given the proper inlet and outlet sizes, wouldn't something like this >> strange looking pump be a good spare? For $35, I would carry one of >> those >> around with me just in case. >> >> Mark >> >> >> > >


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