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RonS

I have an Airtex electric fuel pump, aka Thumper solenoid on my hornet. Some kind of sealant is dripping from the seam. It is like a tacky hard silicone. Has any one ever seen this before? I changed the pump, of course, and replaced it with a Delco.

Park_W

Is Autopulse the brand name? What you describe is like the problem encountered with the Walbro pumps (some marked as AC brand). It's a bellows-type diphragm, and they're all turning to sticky putty with either age or modern fuels (Walbro denies the age problem, but I've seen too many bad ones that have never been on a car, and one diaphragm of my own that was new, in a repair kit. Even if your pump isn't a Walbro, it may have the same diaphragm material.

RonS

Park, I felt it was the gas attacking the sealant also. The pump was on my shelf for quite some time. I saw some of the stuff on the housing when I installed it, but attributed it to poor assembly standards.The stuff literally dripped on to the floor of my garage. That is what got my attention. Bad deal. It is an Airtex from about 1998. I was curious to see if any one has had this problem with solenoid pumps that were purchased recently.

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