Part Found Under Car After Drive Help!

[Joe L.]

Re: Is this a Fuel Pump Pivot Pin I Found?

Joe, Should I be able to pass a wire tie through the pushrod hole. Is the pin hollow?

Larry-----


My recollection is that a roll pin was used for the fuel pump rocker arm pivot. A roll pin is hollow. Thus, it would be possible to pass a thin wire through it.

[David G.]

Re: Is this a Fuel Pump Pivot Pin I Found?

This roll pin does not look familiar in a Corvette, and it does not appear to have been installed. No scratches or stress marks.
I would look elsewhere.
Dave

[Edward B.]

Re: Is this a Fuel Pump Pivot Pin I Found?

I've always enjoyed dropping little parts like this under friend's cars or leaving them on workbenches when they're getting to the end of a project. It has been done to me so it's only fitting to pass the tradition along.

[Tom G.]

Re: Is this a Fuel Pump Pivot Pin I Found?

I think there are two locating pins used for the timing chain cover.

[Ed S.]

Re: Is this a Fuel Pump Pivot Pin I Found?

The pin looks too familiar to me. Out of curiosity, I googled the term "shear pin" and then viewed "images" for the results. Got lots of results including the one shown in the attached pic. Looks similar (but not identical) to the one found under your car. The application for this particular sheer pin is for the an aluminum propeller on a Mercury/Marine outboard 3 hp engine. Don't know what other kind of power yard or garden equipment (or boats) you store in your garage but if it were me I would begin examining and investigating other devices. I would hate to have a motor driven power tool rapidly disassemble while I was using it if you know what I mean. sheer pin.jpg

[Frank D.]

Re: Is this a Fuel Pump Pivot Pin I Found?

I posted a pic of an original fuel pump pivot pin on the Corvette Forum - it is very different from what you depict here.
As stated, your car would NOT be running if what you found was a pivot pin. That fuel pump diaphragm won't magically
pump gas to your carb unless the pump actuator arm is pulsing it...

[Don H.]

Re: Is this a Fuel Pump Pivot Pin I Found?

I have to disagree, the car could run without the pin in the fuel pump. My '65 lost that pin coming home from the Hershey Convention. It would run then loose gas, then run - for a long time. The car DID make it home under it's own power although I have no idea how it worked. I chased my tail because of the intermittent problem and only found it when I finally pulled the pump (which is more complicated with AC). You should be able to see it on the car with a mirror and light. Good luck, Don H.

[John D.]

Re: Is this a Fuel Pump Pivot Pin I Found?

When rebuilding a fuel pump don't listen to guys telling you that you must remove the pin and take the actuating levers off. Not necessary. Now if you do you end up with a roll pin with two ugly clips holding it in.

Larry, Your pin appears to be a tad short for a fuel pump pin. They are at least 1-1/8" long. Don't know the OD JD

Correction: Larry.. I think your pin IS a fuel pump pin. I have a box of 4657's. Junkers, etc. Just looked at one and said there's Larry's pin.

[Frank D.]

Re: Is this a Fuel Pump Pivot Pin I Found?

I don't take the actuating lever off during a rebuild.
I've never experienced a missing pin so I can't say. Others I know have had a pin partially come out and the pump acted flaky as described above. If the pin were completely out I don't know how the diaphragm could work or the poppit valves could operate...
IN ANY CASE - if that were the pin that was found the car would NOT run normally....suffice it to say..

[Larry B.]

Re: Is this a Fuel Pump Pivot Pin I Found?

Thanks everyone for your input! The roll pin is the culprit. And yes Don you are correct, the car will run without it. How long is another question I did not want to find out!

[Joe L.]

Re: Is this a Fuel Pump Pivot Pin I Found?

Thanks everyone for your input! The roll pin is the culprit. And yes Don you are correct, the car will run without it. How long is another question I did not want to find out!

Larry------


Are you saying that you confirmed that the pin had fallen out of the fuel pump?

By the way, I think I was incorrect that the pivot pin was a roll pin. The more I thought about it and saw what others posted, I think the pin on these early style "screw" type pumps was a solid pin.

[Larry B.]

Re: Is this a Fuel Pump Pivot Pin I Found?

Joe, I was able to buy a small mirror and the pin fell out as I backed into the driveway. It is a solid pin not hollow. Pin pictured is used in the Airtex pumps that is why it was hard to identify. Luck strikes again!

[John D.]

Re: Is this a Fuel Pump Pivot Pin I Found?

Larry, Buy some 271 Loctite/Permatex. Called the Red Loctite. Confusing.
271 is permanent. Pin will never come out again. Yes there are many other sealants to use but 271 should do it. John

[Larry B.]

Re: Is this a Fuel Pump Pivot Pin I Found?

Hi John, doesn't the pin have to rotate? Would the permanent loctite stop that?

[Larry B.]

Re: Is this a Fuel Pump Pivot Pin I Found?

I as well of others here on CF have lost the fuel pump pivot pin on the Airtex fuel pump causing premature failure.

I just got off the phone with Airtex and they were not aware of this problem and are interested in correcting it. The gladly sent me another pump free of charge and will be advising me if it is ok to seal the ends of the pump to keep the pin from working it's way out.

Airtex is interested in hearing from anyone else who has had this problem so they can correct it. If you had a recent failure they may replace the pump for you.

You can contact Shane at tech support [IMG]resource://skype_ff_extension-at-jetpack/skype_ff_extension/data/call_skype_logo_ui1.png[/IMG] FREE1-800-424-7839 ext 3 to give him the circumstances of your pump failure.