Weber pump jet removal tool - Alfa Romeo Bulletin Board & Forums
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post #1 of 9 (permalink) Old 01-11-2019, 08:42 AM Thread Starter
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Weber pump jet removal tool

I made this tool using advice received from Gordon Raymond. It is to remove accelerator pump jets from Webers which in my case were seriously stuck. I ground the hole in the center of a pair of cheap HF end cutters so that they grip all the way around the groove at the top of the jets. when I still could not shift a couple of them I used a large screwdriver to lever under the jaws of the cutter. I used them again today to swap some jets that had been in the carbs only a short time and they came out easily.
I ground the holes using a Dremel and a couple of small burrs.
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Ed Prytherch
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post #2 of 9 (permalink) Old 01-11-2019, 09:22 AM
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post #3 of 9 (permalink) Old 01-12-2019, 07:11 AM
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Nice Ed.

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post #4 of 9 (permalink) Old 01-12-2019, 09:11 AM Thread Starter
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It may not be obvious from the pictures but the hole is tapered so that the inner surface of the jaw makes good contact with the top of the groove in the jet.
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Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #5 of 9 (permalink) Old 01-12-2019, 09:45 AM
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Pump jets on Spanish Webers often the left one (?) stick because the bore hole to the Weber throat does not align perfectly with the "hub-with-the-flat" on the pump jets. This is a body casting flaw, and seems to be improving over time. The other reason for sticking, Italian OR Spanish, is hardened fuel varnish around that same hub. I've used carb cleaner and unmodified little side cutters for removal for years. Ed's modification of the cutter is SWEET! No jet nicks!


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post #6 of 9 (permalink) Old 01-12-2019, 10:24 AM Thread Starter
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I have had a series of stuck jets in these Spanish Webers. I know that they sat for a long time before I bought them but I wonder if there is a metallurgical difference that makes surface corrosion between the alloy bodies and the brass jets. These are the same ones that I sent to you Gordon, a couple of years ago.

Ed Prytherch
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A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #7 of 9 (permalink) Old 01-12-2019, 09:14 PM
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If you look closely at the stuck jets, once pulled Ed, you often see the sealing aluminum washer beneath them bent up into the edge of the hub-with-the-flat. This doesn't happen with old Italian Weber bodies. Pump jets stuck there are usually from fuel/varnish goop. Also, pulled jets show no aluminum oxide corrosion on the jet hub, unless they have sat in water.
There is one other issue I have not checked, which is the exact dimensions of NEW sourced pump jets as compared to NEW-old-Italian manufacturer pump jets. I have some of both, and will get around to a mike check one of these days.


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post #8 of 9 (permalink) Old 01-13-2019, 06:14 AM Thread Starter
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I just got some pump jets from the Czech Republic and they fit fine with no interference. They came with new aluminum washers.
Do you think that ethanol fuel could be contributing to this?

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #9 of 9 (permalink) Old 01-13-2019, 10:37 AM
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Maybe long term if it sits Ed. Usually you see it as pitting on the brass when "fuel" starts to go bad. You usually see the white aluminum oxidation first. If you pull a jet and it's got white on the boss or polished, pitting on the boss, it's a modern fuel issue.
I see lots of DCOE Webers that come in for restoration with pitting on the pump bleed-back or exhaust jets that live in the bottom of the fuel bowl.
This is just from my own experience.


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