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-   -   Humming fuel pump solved, costs....50 cents (https://rennlist.com/forums/diy-964-1989-1994-911/197301-humming-fuel-pump-solved-costs-50-cents.html)

Arjan B. 09-16-2004 04:09 PM

Humming fuel pump solved, costs....50 cents
 
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Today I had the idea to solve the humming sound of the fuel pump. I was thinking how to do this and what the cause of the humming was. I suspecter metal to metal contact from the pump, and I found the following cause.....

The bolts go thru a rubber and inside the rubber is a metal peice to prevent over tightning the installation of the pump. This is metal to metal contact to the bracket who is welded to the body. I removed the metal parts and put some rubber [fuel hose] pieces in stead of those. Now we have no metal to metal contact which brings sound to the body. It works........

Arjan B. 09-16-2004 04:13 PM

To remove the pump out of his bracket is easy, just remove the protection plate and 3 bolts......

Arjan B. 09-16-2004 04:30 PM

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Pic of old situation

Arjan B. 09-16-2004 04:43 PM

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This is the result. Use some Loctite on the bolts to prevent running loose.

Arjan B. 09-16-2004 04:49 PM

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Fixed in 1/2 an hour.........

Sound is gone for at least 75 % less. Worth a try for your car if you have this problem.


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