Best Fuel Sender Gasket Source

[Chris D.]

Who is my best source for a functional gasket? Saw lots of discussion in recent history but did not come away with a clear direction.

Replaced sending unit this spring, ran most of the summer with no issues, thought I was in the clear so reinstalled spare tire carrier and what do you know - started dripping a month later.

GM discontinued, Doc R is out of stock, Long Island & Paragon gone, what's left? I have little confidence what I see on Rock Auto.

Chris

[Leif A.]

Re: Best Fuel Sender Gasket Source

How about your local Chevy dealer? Bring them the part number (3825206)...if they don't have it in stock (quite possible), they should be able to get one for you. Then, of course, there's always Amazon and E-bay. Just one example below.

https://www.ebay.com/itm/115684895730

[Chris D.]

[Vince C.]

Re: Best Fuel Sender Gasket Source

Guys,

I recently purchased a gasket from Quanta (gastanks.com). No leaks or issues. Just make you have everything centered when tightening the ring.

Good Luck!

Vince
33415

[Mark M.]

Re: Best Fuel Sender Gasket Source

Chris are you using the original locking cam? Many of the leak issues showing up when the sending unit is serviced is the poorly made locking cams sent from most of the sources of these. The originals and NOS 3774937 have the 3 correct size cam lobes to tightly compress the seal. Even the Canadian tank manufacturer has sent them out with the lesser cam lobes. It should go on tight enough were a tool is needed. If you could almost turn it all the way on by hand, it's loose.

[Joe L.]

Re: Best Fuel Sender Gasket Source

Showed discontinued on GMpartsdirect.com. I’ll check with a dealer to see if I was misdirected. Thanks.

Chris------


GM #3825206 is discontinued. The only way a dealer that does not have them in stock could get them is to obtain them from another dealer that does have them in stock.

[Gary B.]

[Chris D.]

Re: Best Fuel Sender Gasket Source

Found a couple seals still on the shelf in a small town dealer. They're on the way so we'll see. Good to know Quanta is a reliable option. Makes sense the tank experts would ensure a functional system. Cam part number is still active. I'll report back once all the bits are installed.

Chris

[Mike T.]

Re: Best Fuel Sender Gasket Source

Today, while rummaging through my stash of Corvette parts, I came across an 'old' ziplock bag of fuel tank/sender O-rings. The only gas tank I've had to replace was on my 65 Coupe and best guess was that I did that back around 20 or more years ago. I used to drop down to my local Chevy Dealer Parts Department with a list of 10-20 GM part numbers to see if any of them were still available and if so, I typically bought two or three of them but in this case, I have a zip-lock baggie of '3' fuel tank/sender unit O-rings and oddly, no original GM bag with them to identify the part number or group. I do believe these are GM O-rings/gaskets but wanted to ask if anyone knows if there is a good way to determine original GM O-rings from aftermarket versions?
Thanks, Mike T

[Ed S.]

Re: Best Fuel Sender Gasket Source

This may surprise you but...... many models of 1961 through 1969 Pontiacs used the same O-ring gasket (GM # 3825206). I found a GM NOS parts vendor in Kansas that had 31 of them - was asking $8 for one - I bought 2 (not for sale). He has none left now but.... he was not aware of the fact that these O-rings are scarce and rare items and that they also were used on Corvettes. You might try searching websites that deal in Pontiac NOS parts - they may have a few left laying around. Good luck.

[John F.]

Re: Best Fuel Sender Gasket Source

Have you tried taking the old "0" ring to a place that sells hydraulic lines?

[Joe L.]

Re: Best Fuel Sender Gasket Source

This may surprise you but...... many models of 1961 through 1969 Pontiacs used the same O-ring gasket (GM # 3825206). I found a GM NOS parts vendor in Kansas that had 31 of them - was asking $8 for one - I bought 2 (not for sale). He has none left now but.... he was not aware of the fact that these O-rings are scarce and rare items and that they also were used on Corvettes. You might try searching websites that deal in Pontiac NOS parts - they may have a few left laying around. Good luck.

Ed-------

Not just Pontiacs. The GM #3825206 gasket was used across all GM car and truck lines for many years

[Ed S.]

Re: Best Fuel Sender Gasket Source

Ed-------

Not just Pontiacs. The GM #3825206 gasket was used across all GM car and truck lines for many years

Didn't know that. You would think that a lot of them would still be around. Where did they all go??????

[Ed S.]

Re: Best Fuel Sender Gasket Source

You know, there are a lot of threads about how the replacement gaskets don't work. People state that they leak and they are not the same as the OEM gasket. I have 2 OEM gaskets. the OER gaskets are available from a lot of vendors. Summit sells one for $3.99. I am going to get one from Summit and compare its dimensions (with a micrometer) to the OEM O-ring I have..... and then report the results on this forum. Before I order one from Summit I want to ask Joe (and others) is there an alternative source I should get one from to do the comparison? Just about every vendor carries the aftermarket O-ring. Is one supplier preferred over another?

[Gary B.]