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25 & 36 hp fuel pump
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70deluxebus
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PostPosted: Mon Sep 26, 2011 1:37 pm    Post subject: 25 & 36 hp fuel pump Reply with quote

Does anyone know the difference and how to tell them apart? Thanks
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36hplandspeedracer
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PostPosted: Mon Sep 26, 2011 2:52 pm    Post subject: Reply with quote

Lindy, contact Ed Fall at Vintage Werks for the specific details. He is the premier rebuilder of these components and can supply you with specific details for indentification.

[email protected]

I hope this is helpful..................

Burly
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henry roberts
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PostPosted: Mon Sep 26, 2011 4:30 pm    Post subject: Reply with quote

here is a rough run down, the emphasis being on rough.

split etc till 1953? flat top. towards the end of this style they changed from an 8mm fuel line to a 6mm fuel line, there were probably heaps of other changes.

Image may have been reduced in size. Click image to view fullscreen.


till mid 1955 wave top with drain screw on the side:

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a few months? only mid/late 55, wave top with the boss for the drain screw but not tapped/fitted with the screw.

sorry can't find a pic atm.

56 wave top with no screw: edit, this may not be an actual production model.

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circa 57, ribbed top with short outlet:

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changed in 58? to ribbed top with tall outlet:

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the last style

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some useful threads:

54/5 engine thread:

http://www.thesamba.com/vw/forum/viewtopic.php?t=179439

58/9 thread:

http://www.thesamba.com/vw/forum/viewtopic.php?t=401420


Last edited by henry roberts on Mon Sep 26, 2011 10:54 pm; edited 1 time in total
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EverettB Premium Member
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PostPosted: Mon Sep 26, 2011 8:29 pm    Post subject: Reply with quote

Nice breakdown.

Some more info:
53s are 6mm because they have the carburetor with the accelerator pump.

henry roberts wrote:
56 wave top with no screw:

Image may have been reduced in size. Click image to view fullscreen.


I've never heard that, I think that might just be a mismatched top and bottom.
For example, the bottom wore out so it was replaced while the original top was retained.
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henry roberts
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PostPosted: Mon Sep 26, 2011 10:10 pm    Post subject: Reply with quote

i could be wrong, it's been known to happen Smile
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70deluxebus
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PostPosted: Tue Sep 27, 2011 6:44 am    Post subject: Thanks guys. Reply with quote

Appreciate the help.
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WVWZ
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PostPosted: Thu Mar 17, 2016 3:46 pm    Post subject: Re: 25 & 36 hp fuel pump Reply with quote

Nice write up, I've been looking up and down thesamba and can't find a thread on how to rebuild a 36hp fuel pump. Can anyone here direct me to the proper thread? Thank you.
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PostPosted: Thu Mar 17, 2016 5:39 pm    Post subject: Re: 25 & 36 hp fuel pump Reply with quote

WVWZ wrote:
Nice write up, I've been looking up and down thesamba and can't find a thread on how to rebuild a 36hp fuel pump. Can anyone here direct me to the proper thread? Thank you.


I don't know if there is one but I found these 2 threads:
http://www.thesamba.com/vw/forum/viewtopic.php?t=86375
http://www.thesamba.com/vw/forum/viewtopic.php?t=465328
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oldbusboy
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PostPosted: Thu May 18, 2017 10:03 pm    Post subject: Re: 25 & 36 hp fuel pump Reply with quote

If I currently have stock 6mm fuel pump and want to run a Mann fuel filter that is 8mm how can I make the input line into the pump 8mm so I can use the filter?

Trevor

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Mr. OGPaint
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PostPosted: Fri May 19, 2017 1:48 pm    Post subject: Re: 25 & 36 hp fuel pump Reply with quote

Perhaps a brass adapter bushing similar to the ones VW offered for retrofitting 6mm components on cars with 8mm fuel systems....same concept but in reverse.
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Peter_Plade
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PostPosted: Sat May 20, 2017 12:57 pm    Post subject: Re: 25 & 36 hp fuel pump Reply with quote

HerrLowlight wrote:
If I currently have stock 6mm fuel pump and want to run a Mann fuel filter that is 8mm how can I make the input line into the pump 8mm so I can use the filter?

Trevor

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If you comes up with a solution please post it here as I'm planning the to the same thing.
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Suboval
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PostPosted: Mon May 22, 2017 12:09 pm    Post subject: Re: 25 & 36 hp fuel pump Reply with quote

Mr. OGPaint wrote:
Perhaps a brass adapter bushing similar to the ones VW offered for retrofitting 6mm components on cars with 8mm fuel systems....same concept but in reverse.


https://www.thesamba.com/vw/forum/viewtopic.php?t=478666&highlight=fuel+pump+adapter
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