Home-made fuel pump rebuilding jig

[Big Bill]

[64bugg]

Just to add to this thread for a 36hp pump at tdc the plunger is at the correct 35mm hieght so no tool needed. Also it put my ww diaphram at a relaxed fit so easy top install with it on the motor. It will be awhile before i can run it on my new build but anxious to see where my fuel pressure falls.

[kevincoupnj]

I just rebuilt an original pierburg fuel pump for my 1967 bug. Thanks to all for the info on the preload requirement and jig. I found it easy to assemble the fuel pump, leaving the upper housing screws loose enough allow the diaphragm to move. After setting the preload on the bench jig, which will pull the diaphragm into the lower housing, you can tighten the screws.

[sweden]

This is how my fueltool look like. Took 5 minutes to make and have been used for many years.

M10 thread in the bakelite and in with a screw of right length.

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[wcfvw69]

[anthracitedub]

Yeah, I usually put them together without a jig... getting ready to build a few and came across this thread. I thought I’d whip one up with what I had laying around and try it out. I took apart one pump and it’s missing a small reed/check valve and the small retainer plate/screw... so I gotta find those pieces before I can play.

[wcfvw69]

^^ That's slick

I have an original jig and find I don't use it. I prefer my bench vise. I put a punch in it 13MM above, push the body down to pull the diaphragm into position and tighten the 6 screws. Much faster.
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[anthracitedub]

Just wanted to share my jig I made from some plastic I had laying around. It already had a hole centered in it so I just played off that. Set a pin in the middle at 13mm and tapped two 8x1.25mm studs in it.

Clamps nicely in my hobby vice.

[APPLEGREENVW]

[Sharp64]

[scottyrocks]

This^ looks like it was made from something else (that's how professional it looks if completely-from-scratch homemade).

What is it made from, if not completely homemade?
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“If you care for a thing long enough, it takes on a life of its own, doesn't it? Mending old things, preserving them, looking after them – on some level there's no rational grounds for it.”
– D. Tartt, 'The Goldfinch'

[APPLEGREENVW]

Here's my homemade pre-load fuel pump tool. I haven't tested the tool yet.

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02/76 Beetle sedan

[wcfvw69]

[Who.Me?]

[kreemoweet]

[wcfvw69]

[randydog]

whittle 14 mm piece of wood that fits the bottom of fuel pump,insert 14 mm wood chip, push pump down flush with flat surface, tighten screws. WA-la!

[kreemoweet]

The pump diaphragm preload has nothing to do with the output pressure. It's a safety measure to ensure the diaphragm is not ruptured by being pulled
on too hard. A ruptured diaphragm could quickly turn your vehicle into a big ball of fire.

The 3-5 psi output pressure given in the Bentley manuals is somewhat suspect, as many have reported no problems running with considerably less output pressure, on the same engines
with the same carbs.

As long as the pump volume output meets the specced 400 cc/min @ 3800-4000 rpm, which seems more than any stock engine would use, there should be no problem. If output
nevertheless seems insufficent, a thinner (or no) washer under the carb float valve could make things right.
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[wcfvw69]

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