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wcfvw69
Samba Purist
Joined: June 10, 2004
Posts: 13696
Location: Arizona
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 Posted: Sun Nov 02, 2025 11:13 am Post subject: Re: 25hp / 36hp fuel pumps repair |
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| Ted2 wrote: |
Hi everyone,
Is there a repair solution for damaged threads in the inlet side of the fuel pump? |
Yes. A milling machine to accurately drill out the old threads and the bore to the correct size to tap and install a thread insert. 
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Ted2
Samba Member
Joined: April 07, 2004
Posts: 284
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| Posted: Sun Nov 02, 2025 5:01 am Post subject: Re: 25hp / 36hp fuel pumps repair |
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Hi everyone,
Is there a repair solution for damaged threads in the inlet side of the fuel pump? |
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wcfvw69
Samba Purist
Joined: June 10, 2004
Posts: 13696
Location: Arizona
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| Posted: Thu Apr 03, 2025 3:26 pm Post subject: Re: 25hp / 36hp fuel pumps |
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| thom wrote: |
So is it supposed to be a drain (as I've heard it referred to) or just a way to remove the spring? I was going through my stash of cores to rebuild a pump for my deluxe, and found this one.
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Nope, not a drain but a post for one side of the rocker spring to secure to. If you look at the backside of the pump mounting flange, it has an indention at the lower side. So, when the pump is bolted up, there is a small gap between the gaskets where fuel could drain out there if the diaphargms failed and leaked gas to the bottom of the pump.
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40+ years of VW repair, and VW parts and vehicle restoration experience.
The Samba member since 2004.
**Now rebuilding throttle bodies for VW's and Porsche's**
**Restored German Bosch distributors for sale or I can restore yours**
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thom
Samba Member
Joined: October 12, 2000
Posts: 6266
Location: Sacramento
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| Posted: Thu Apr 03, 2025 11:14 am Post subject: Re: 25hp / 36hp fuel pumps |
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So is it supposed to be a drain (as I've heard it referred to) or just a way to remove the spring? I was going through my stash of cores to rebuild a pump for my deluxe, and found this one.
| wcfvw69 wrote: |
| thom wrote: |
| Dumb question: what is the purpose of the screw on the lower pump body? |
The 25HP pumps and the 1954 36hp pump had the screw/plug that had a stud on it that the rocker spring slid onto. The other side of the spring was held against the rocker. In 1955, the lower casting was the same but not drilled out or threaded, that post or stud was built into the casting that the spring sat against from then on out.
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wcfvw69
Samba Purist
Joined: June 10, 2004
Posts: 13696
Location: Arizona
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| Posted: Wed Apr 02, 2025 5:19 pm Post subject: Re: 25hp / 36hp fuel pumps |
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| thom wrote: |
| Dumb question: what is the purpose of the screw on the lower pump body? |
The 25HP pumps and the 1954 36hp pump had the screw/plug that had a stud on it that the rocker spring slid onto. The other side of the spring was held against the rocker. In 1955, the lower casting was the same but not drilled out or threaded, that post or stud was built into the casting that the spring sat against from then on out.
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Contact me at [email protected]
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40+ years of VW repair, and VW parts and vehicle restoration experience.
The Samba member since 2004.
**Now rebuilding throttle bodies for VW's and Porsche's**
**Restored German Bosch distributors for sale or I can restore yours**
**Restored German Pierburg fuel pumps for sale or I can restore yours**
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thom
Samba Member
Joined: October 12, 2000
Posts: 6266
Location: Sacramento
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| Posted: Wed Apr 02, 2025 2:23 pm Post subject: Re: 25hp / 36hp fuel pumps |
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Dumb question: what is the purpose of the screw on the lower pump body?
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1956 Single Cab
1957 Porsche 356A Sunroof
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Mr. OGPaint
Samba Member
Joined: September 24, 2010
Posts: 844
Location: Oregon
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| Posted: Fri Feb 28, 2025 11:39 am Post subject: Re: 25hp / 36hp fuel pumps |
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| gypsydoctor wrote: |
Could this "flat top" fuel pump be from a Porsche? I got it from a box of parts from my dad, who had a 1958 Porsche engine. |
'
That is a 356 fuel pump and adapter, 8mm inlet like the early VW was used on Porsche thruout production.. I believe yours is from an early 3pc case, 1955 thru whenever the newer pump was introduced. The earlier 2pc case used the same pump but the 3pc. case required the adapter you've pictured.
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wcfvw69
Samba Purist
Joined: June 10, 2004
Posts: 13696
Location: Arizona
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| Posted: Sat Jan 25, 2025 8:19 pm Post subject: Re: 25hp / 36hp fuel pumps |
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| esde wrote: |
Here are two I have that are both zwitter 25hp, not sure why one has the odd adapter fitting.
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I wonder if that adapter fitting is a thread insert. Some inserts have thick shoulders on them. I see lots of these 25/36hp pumps with damaged threads from cross threading the screw in fuel lines.
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Contact me at [email protected]
Follow me on instagram @sparxwerksllc
40+ years of VW repair, and VW parts and vehicle restoration experience.
The Samba member since 2004.
**Now rebuilding throttle bodies for VW's and Porsche's**
**Restored German Bosch distributors for sale or I can restore yours**
**Restored German Pierburg fuel pumps for sale or I can restore yours**
**Restored Porsche fuel pumps or I can restore yours**
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wcfvw69
Samba Purist
Joined: June 10, 2004
Posts: 13696
Location: Arizona
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| Posted: Sat Jan 25, 2025 8:16 pm Post subject: Re: 25hp / 36hp fuel pumps |
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I just rebuilt three 36HP pumps for a customer and took some photo's for reference. One is the late 1958 version with the tall neck on the outlet. I do see a lot of these tall new 1958 pumps as well.
The 1956 pumps have the identical base to the 1958 pump as the rounded hump for the screw in rocker holder/plug at the base of the lower section of the pump was gone.
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Contact me at [email protected]
Follow me on instagram @sparxwerksllc
40+ years of VW repair, and VW parts and vehicle restoration experience.
The Samba member since 2004.
**Now rebuilding throttle bodies for VW's and Porsche's**
**Restored German Bosch distributors for sale or I can restore yours**
**Restored German Pierburg fuel pumps for sale or I can restore yours**
**Restored Porsche fuel pumps or I can restore yours**
**Restored Porsche distributors or I can restore yours** |
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esde
Samba Member
Joined: October 20, 2007
Posts: 6379
Location: central rust belt
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| Posted: Sat Jan 25, 2025 7:46 pm Post subject: Re: 25hp / 36hp fuel pumps |
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Here are two I have that are both zwitter 25hp, not sure why one has the odd adapter fitting.
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EverettB 
Administrator
Joined: April 11, 2000
Posts: 71799
Location: Phoenix 602
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| Posted: Sat Jan 25, 2025 5:44 pm Post subject: Re: 25hp / 36hp fuel pumps |
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| tasb wrote: |
| Quote: |
| There's a question though, as progressive refinements says there's a change in June 1958 to a longer output.... I've seen quite a few of the longer neck versions, and it would be hard to believe it's only a five month production. |
Not at all hard to believe. There are some distributor versions that were in production for less than a month. |
It doesn't seem to weird given that they changed the entire style by adding a filter.
Maybe Hans had been arguing for the filter add for years and finally got it approved. 
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tasb
The Distributor Distributor
Joined: April 27, 2002
Posts: 6862
Location: Pentwater, Michigan
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| Posted: Sat Jan 25, 2025 4:00 pm Post subject: Re: 25hp / 36hp fuel pumps |
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| Quote: |
| There's a question though, as progressive refinements says there's a change in June 1958 to a longer output.... I've seen quite a few of the longer neck versions, and it would be hard to believe it's only a five month production. |
Not at all hard to believe. There are some distributor versions that were in production for less than a month.
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Bub
Samba Member
Joined: June 10, 2004
Posts: 1326
Location: Central Washington
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| Posted: Sat Jan 25, 2025 11:43 am Post subject: Re: 25hp / 36hp fuel pumps |
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| Bub wrote: |
Don't fergit' about the legendary clear-top filter pump rarest-of-the-rare accessory, adds 13 donkey power.
I had to have chrome for I am fancy.
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Ted2
Samba Member
Joined: April 07, 2004
Posts: 284
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| Posted: Fri Aug 23, 2024 6:59 am Post subject: Re: 25hp / 36hp fuel pumps |
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Great thread and timely too as I'm getting ready to rebuild a coupe of fuel pumps.
Where can I find the correct screws for the top plate? |
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gypsydoctor
Samba Member
Joined: October 13, 2012
Posts: 1
Location: United States
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| Posted: Thu Aug 22, 2024 6:35 am Post subject: Re: 25hp / 36hp fuel pumps |
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Could this "flat top" fuel pump be from a Porsche? I got it from a box of parts from my dad, who had a 1958 Porsche engine. |
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bwaz
Samba Member
Joined: August 24, 2004
Posts: 1815
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| Posted: Mon Aug 19, 2024 1:24 pm Post subject: Re: 25hp / 36hp fuel pumps |
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I'm trying to guess when they changed from the 36hp shorter outlet spout to the taller one (before the addition of the extra filter screen) I came across a beautiful July 57 which has an all original engine. It had the taller outlet fuel pump with case date 20-6-27, and Fuel pump 3181447. Another friend has a long spout version with serial number 3156534 which is 24,913 earlier. It looks like they were making about 16,000 beetles a month, (plus busses) so I'd estimate these taller neck fuel pumps were at least on June 57 beetles, maybe up to December 1958.
There's a question though, as progressive refinements says there's a change in June 1958 to a longer output.... I've seen quite a few of the longer neck versions, and it would be hard to believe it's only a five month production. |
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Bub
Samba Member
Joined: June 10, 2004
Posts: 1326
Location: Central Washington
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| Posted: Wed Aug 14, 2024 3:06 pm Post subject: Re: 25hp / 36hp fuel pumps |
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Don't fergit' about the legendary clear-top filter pump rarest-of-the-rare accessory, adds 13 donkey power.
I had to have chrome for I am fancy.
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| hitest wrote: |
| Had a girlfriend once who shall we say, nearly arrived at the mere sight of a semaphore in action- easy to please she was... |
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bwaz
Samba Member
Joined: August 24, 2004
Posts: 1815
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| Posted: Wed Aug 14, 2024 1:44 pm Post subject: Re: 25hp / 36hp fuel pumps |
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On my Nov 1 built zwitter, which seemed to have all the correct original engine parts, I restored the fuel pump with serial number 764520.
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oldslow
Samba Member
Joined: July 27, 2019
Posts: 140
Location: Cape Cod
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| Posted: Tue Jul 16, 2024 11:36 am Post subject: Re: 25hp / 36hp fuel pumps |
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Is this a real 1955 or there abouts 356 fuel pump?
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oldslow
Samba Member
Joined: July 27, 2019
Posts: 140
Location: Cape Cod
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| Posted: Tue Jul 16, 2024 11:23 am Post subject: Re: 25hp / 36hp fuel pumps |
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Some good information on the early 356 fuel pumps and the 36hp pumps in general.
https://www.type356a.com/installation.html
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