[alfaparticle]

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.

 

[mygtveloce]

XXX

 

[65Sprint]

Nice Ed.

 

[alfaparticle]

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.

 

[Gordon Raymond]

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!

 

[alfaparticle]

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.

 

[Gordon Raymond]

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.

 

[alfaparticle]

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?

 

[Gordon Raymond]

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.

 

[dhunt]

Apologies for reviving this old thread, but I'm having this exact issue with the pump jets not fitting correctly in these new repro webers. They are now currently stuck, but thanks for the tool instructions, @alfaparticle!

@Gordon Raymond I'm curious if you have any suggestions on how to remedy this poor casting issue. In addition to the jets getting stuck after being seated with the top cap, I also noticed a few of them not sitting as far down into the throats as they should be.

 

[Gordon Raymond]

This was an ongoing issue with earlier Spanish Webers, seemingly somewhat resolved now. It was usually confined to just the left jet cast in hole. First, many of these bodies were 40DCOE151's though it did extend to others. With the 151's, a secondary cause was the pump jet binding in the "U" cutout in the primary choke. This requires the air-bleed tapered needle over that particular jet (one mid positioned over each throat)...

.... be removed as these position the secondary choke. That often frees up the bind. Remember to REPLACE that needle afterwords!
The easy method to get standard pump jets to fit is to file the flat on the jet body by trial to fit that position on the Weber. This does no harm, but other pump jets will require similar fine file work.
If just one jet does not seat deep enough, that boss needs modification. It should seat on the tiny aluminum compression seal used with all idle jets. If you note all 4 appear seated, but are too short, that is due to the availability of several different types of idle jets available. Some ARE shorter than one normally sees on DCOE Webers. Others squirt DOWN rather than toward the plate and centered in the secondary choke venturi. I've had some aftermarket "weber" pump jets that squirted in the wrong
direction!
Yes, I have modified the faulty body casting in a few of these bodies using a tiny dental burr and considerable patience. It's not worth the effort. Easier to modify the jet.
Need more?

 

[dhunt]

Appreciate the quick response, Gordon. Will try some fine filing of the jets along with the bleed screw+secondary choke adjustment upon installation.

It's a good thing you don't bill us here for all of your knowledge! 🙏

Best,
D

 

[Gordon Raymond]

I have no secrets. Only experience given free so others don't have to figure out resolved issues.
THAT is the purpose of the Alfa BB. Shared experiential knowledge, INCLUDING what "not-to-do"!