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Re: Fuel pump woa's

To: Carolyn/Rick <walters@mail.softcom.net>
Subject: Re: Fuel pump woa's
From: Trevor Boicey <tboicey@brit.ca>
Date: Tue, 25 May 1999 02:59:43 -0400
Cc: Spridgets <spridgets@autox.team.net>
Organization: BRIT Inc.
References: <374A2B2D.D1F1B529@mail.softcom.net>
Reply-to: Trevor Boicey <tboicey@brit.ca>
Sender: owner-spridgets@autox.team.net
Carolyn/Rick wrote:
> Quick question is driving me nuts.  Anyone on the list running a Weber
> side draft and a SU Pump?  My after market died, and I replaced it with
> a SU that I've been kicking around the shop, it is a new pump.  First
> thing I have noticed is that at sustained 4500 RPM's, she starts sucking
> air no fuel.  If I continue she will run the bowl dry.

  Could it be just that the flow is insufficient?

  You might have a partially blocked fuel lone between
the pump and the carbs. I have seen this before, especially
with cars that come out of storage. Gooey fuel in the carb
bodies, or the little screens at the inlets, and so on.

  The car will start and idle, but as soon as you try to
give it hard, blech. Hard to debug.

  What seems likely to me is that your old pump had higher
flow or pressure, so even though there was a partial
blockage it could maintain fuel flow.

  Perhaps the new pump can't flow fuel through the 
blocked system fast enough to supply the engines needs above
4500rpm. When all was new, the SU pump was more
than adequate, but not so now.

  The cure for me has been just to take the float bowl
lids off the carbs, make sure that was really clean. Then
run a long stiff wire like a clothesline through the
metal fuel pipe from the tank all the way until it comes
out carb end. (usually with a ball of goo at the end)

  After that, problem is usually gone.

-- 
Trevor Boicey, P. Eng.
Ottawa, Canada, tboicey@brit.ca
ICQ #17432933 http://www.brit.ca/~tboicey/
"Yes, absolutely." - FIDO rep / "No, absolutely not." - Other FIDO rep

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