The Portal Hub: All things Pinzgauer, Haflinger, Volvo 303 and more.

The Portal Hub: All things Pinzgauer, Haflinger, Volvo 303 and more.

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View unanswered posts | View active topics It is currently Sun Feb 18, 2018 1:50 pm



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 Bn4 fuel pump rebuild? 
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Joined: Sat Dec 16, 2017 8:09 pm
Posts: 11
Location: Chattanooga, TN
Post Bn4 fuel pump rebuild?
I managed to get the fuel pump working on the Bn4 heater, after taking it apart and cleaning all contacts and removing carbon build up. Put it in and it worked great starting up 3 times and running for 20 minutes or so each time. Go out the next day and it wont start until persuaded w a few hammer taps. I removed it again and verified pump is free and everything is clean and reinstall it and it worked great that day. Wouldn't start following morning.

Everything looks good except the diaphragm is kind of hard and crusty. I saw the video below online and wonder if the diaphragm replacement he did is feasible(safe)? Seems like a dried out membrane kept his pump from working and after replacement it ran like a champ.

Has anyone had experience rebuilding the pump or using the material mentioned?

https://www.youtube.com/watch?v=5Hqj6-9km3w

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1975 710K


Tue Jan 02, 2018 5:07 pm
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Joined: Sat Dec 16, 2017 8:09 pm
Posts: 11
Location: Chattanooga, TN
Post Re: Bn4 fuel pump rebuild?
So i ordered material video poster recomended ($$$). Initially worked but then stopped. The material would stretch and bind up operations. Finally received some nitrile sheet to try and repair(0.8mm) Hopefully this is the solution.

Ill post after install to update. "Electrical" has been slow here:)
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1975 710K


Wed Feb 07, 2018 12:29 pm
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