Accelerator pump leaking gas

[ltinnit]

Hello all,

Been a while, which means truck's been running great! Brief video attached shows what I believe is the accelerator pump leaking gas. Worn gasket in there? Whole thing needs replacing I presume. Is my diagnosis correct, anyone else done this?



Thanks much,
Lloyd.

1968 F100 390

[ltinnit]

update... diagnosis correct. Does anyone know if I need to remove the entire carburetor to remove the accelerator pump, or will removing those 4 screws at the front get me where i need to get? i guess removing those would let me replace the (likely worn) gasket at the very least?

[MAK]

It can be accessed without removal of the carburetor. However, you will be lucky if it’s just the gasket. The actual aluminum housing commonly warps... I’ve had that happen to my original carb and then a fellow member here gave me one from his old carb and I continued to have the same problem. With both I had re-flattened them on a flat surface with abrasive paper. That would work for a short time and then it would warp and start leaking again. Rinse, repeat... Of course the more times you have to flatten it then it seems to warp more the next time due to loss of thickness. I finally gave up and bought a different carb. My best friend lost his restored 66 F100 many years ago when his leaked and caught fire.

[ltinnit]

thanks MAK, and yes, the thought of fuel on the block catching fire is something i'd thought about, clearly going to keep it off the road until I get it fixed.

it does sound like simply putting in a new carb may be the way to go.

again, appreciate your input, thanks!

[Mach428]

Hold on now. I assume you are talking about an Autolite 2100 two barrel carburetor. If so, this is the best carburetor you could have and easily rebuilt. Why not buy a rebuild kit, which comes with new gaskets and accelerator diaphragm. They are easy to rebuild and I've done MANY. Out of those, I have never ran across one with warped aluminum housing.

I completely disassemble the carb and soak in lacquer thinner, then reassemble.

[sargentrs]

It's a shame somebody out there hasn't started manufacturing replacement accelerator pump covers for the 2100. As common as the warpage issue is and as many as are there, it would probably be worthwhile.

Hey, Jamie! Hint, hint...

[tsherry]

I just bought a dozen 2100 accelerator pump diaphragms on ebay for something like $12. If you're running ethanol fuel, the rubber will be consumed by the alcohol, and you end up with a screen, instead of a solid diaphragm.

On the '77 F-350 U Haul truck I'm working on, I pulled the pump cover, replaced the diaphragm. ten minute job, truck starts right up now.

I've never had a warped cover, but if I did, I'd flatten it out on a belt sander. It's not like this is a high precision part.

[tsherry]

Similar to these. Five for four bucks.


https://www.ebay.com/itm/5-Hygrade-acce ... 2749.l2649

[sargentrs]

I think it sux that nobody remans the cover. You can get replacement covers for Holleys and even the Autolite 1100 but not the 2100, 2150 or 4150.

[MAK]

I think it sux that nobody remans the cover. You can get replacement covers for Holleys and even the Autolite 1100 but not the 2100, 2150 or 4150.

I know two local mechanics who both have told me that they have run in to that warping problem many, many times over the years. It’s simple to re-flatten but they too said the casting often quickly warps again.
Doesn’t make any sense to me, especially since they apparently go so many years in service before the problem occurs. Maybe a thicker rubber gasket could compensate for the warp.

[ltinnit]

Hold on now. I assume you are talking about an Autolite 2100 two barrel carburetor. If so, this is the best carburetor you could have and easily rebuilt. Why not buy a rebuild kit, which comes with new gaskets and accelerator diaphragm. They are easy to rebuild and I've done MANY. Out of those, I have never ran across one with warped aluminum housing.

I completely disassemble the carb and soak in lacquer thinner, then reassemble.

thanks (everyone) for your feedback. life got in the way of this project, and i'm now just about to tackle it. frankly I don't even know if it still has the original carb in it, or what kind it is. I assume once I get it pulled-out I'll know the answer to those questions. will report back.

thanks again.

[ltinnit]

Hold on now. I assume you are talking about an Autolite 2100 two barrel carburetor. If so, this is the best carburetor you could have and easily rebuilt. Why not buy a rebuild kit, which comes with new gaskets and accelerator diaphragm. They are easy to rebuild and I've done MANY. Out of those, I have never ran across one with warped aluminum housing.

I completely disassemble the carb and soak in lacquer thinner, then reassemble.

so...it's a motorcraft carb... not an autolite 2100 [image]http://fordification.com/forum/app.php/ ... /image/967[/image]

http://fordification.com/forum/app.php/ ... /image/967

[ltinnit]

final question, I hope!. OK, i've taken the carb off, and the accelerator pump diaphragm is shot. I'm going to do a diaphragm replacement and see if that does the job, as I suspect it will. However......

...... I'm unable to I.D the carb... it's a motorcraft, and the only stamp of any worth on it is a circle within which it says "1.08". Research seems to indicate that makes it a 2150. However, at all local auto parts stores the diaphragm that matches to that carb is slightly rectangular in shape, and my diaphragm is as square as can be.

Any thoughts?