wanted: second spring for 3911 fuel pump

round2K_old · October 9, 2006 at 10:28 PM

Does anyone have any of the auxiliary fuel pump springs to convert the 3911 fuel pumps to dual springs?

Kickstand_old · October 20, 2006 at 6:38 PM

Dave I have a spring off of some of these pumps at my shop if they can help

gja_era · October 20, 2006 at 6:44 PM

I believe you need more than just the second spring. The Hi-Po arm has a detent to hold the spring in position.

round2K_old · October 20, 2006 at 8:30 PM

Dave

I will bring it to Chico and we can compare it to the 3939 in your Shelby museum. Thanks.

65gt_old · November 11, 2006 at 4:09 PM

I have a 3911 button top also, dated Oct '64. Its too late for my Aug '64 car. It has a detent on the body but not on the arm. I'd like to trade it for the correct pump for my car.

round2K_old · November 11, 2006 at 10:11 PM

The 3911 I have does not have the dimple on the arm. I thought I could retrofit based info in Bob Mannel's book - he lists the part # for the second spring - but it won't work without the real deal arm. Live and learn.

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