Fuel Flow Issue on a '68 327/350

[Joel K.]

Hello All,

I'm getting toward the end of a long restoration of a low-mileage '68 convertible with an L79 engine. Carb (Q-jet) has been rebuilt, fuel tank cleaned and resealed, fuel lines blown clean, fuel pump and filter replaced. When I connected everything up and cranked the engine, I get fuel seeping from the fuel filter outlet connection with the filter-to-carb steel line. Disconnected the fuel pipe at the carb and got good flow, with no seepage at the filter. The fuel filter is a repro GF432, purchased from a reputable vendor. Any thoughts on what's going on here and how to remedy it? Thanks!

[Chuck R.]

Re: Fuel Flow Issue on a '68 327/350

When I had seeping fuel connections, I would clean up both components and make sure they were both good and dry.

Then I would coat the end of the fuel line with a fuel resistant shelac type gasket cement and let it set until it was dry. I'd do this two or three times until there was a thick coating of cement on the mating face. The material would still be slightly pliable but stiff enough to stay put.

I would also heavily coat the threads on the lower half or two thirds of the compression nut with the shellac and put it all together nice and tight and letting everything set until it was again dry to the touch.

The goal was to build up the surface where the fuel is seeping by enough so that when I snugged the fittings back together, the cement would bridge the void and squash just enough to seal off the seepage.

I had a pretty good kill rate doing this.

The trick was being patient enough to give the connection time to adequately setup.

One thing to be aware of is making sure that you don't egg shape either the filter or fuel line fittings or nothing will solve your issue short of purchasing new parts. Wrenches not vise grips

Chuck

[Chuck R.]

Re: Fuel Flow Issue on a '68 327/350

When I had seeping fuel connections, I would clean up both components and make sure they were both good and dry.

Then I would coat the end of the fuel line with a fuel resistant shelac type gasket cement and let it set until it was dry. I'd do this two or three times until there was a thick coating of cement on the mating face. The material would still be slightly pliable but stiff enough to stay put.

I would also heavily coat the threads on the lower half or two thirds of the compression nut with the shellac and put it all together nice and tight and letting everything set until it was again dry to the touch.

The goal was to build up the surface where the fuel is seeping by enough so that when I snugged the fittings back together, the cement would bridge the void and squash just enough to seal off the seepage.

I had a pretty good kill rate doing this.

The trick was being patient enough to give the connection time to adequately setup.

One thing to be aware of is making sure that you don't egg shape either the filter or fuel line fittings or nothing will solve your issue short of purchasing new parts. Wrenches not vise grips

Chuck

[Joel K.]

Re: Fuel Flow Issue on a '68 327/350

Chuck,

Thanks very much for this suggestion. I'd like to get this done once and not do a lot of trial and error if possible, so was wondering what gasket cement you use? Thanks!

[Joel K.]

Re: Fuel Flow Issue on a '68 327/350

Chuck,

Thanks very much for this suggestion. I'd like to get this done once and not do a lot of trial and error if possible, so was wondering what gasket cement you use? Thanks!

[Chuck R.]

Re: Fuel Flow Issue on a '68 327/350

Either Indian Head or Permatex gasket cements will work.

Their both dark brown in color and have a maple syrup consistency. Chuck

[Chuck R.]

Re: Fuel Flow Issue on a '68 327/350

Either Indian Head or Permatex gasket cements will work.

Their both dark brown in color and have a maple syrup consistency. Chuck

[Joel K.]

Re: Fuel Flow Issue on a '68 327/350

Chuck,

Many thanks for your suggestion. I used Permatex cement, let it sit for a couple of days, reconnected the fuel line, let it sit another couple of days, and so far, no leaks. (Knock on wood!)

Thanks!

[Joel K.]

Re: Fuel Flow Issue on a '68 327/350

Chuck,

Many thanks for your suggestion. I used Permatex cement, let it sit for a couple of days, reconnected the fuel line, let it sit another couple of days, and so far, no leaks. (Knock on wood!)

Thanks!

[Chuck R.]

Re: Cool! *NM*

[Chuck R.]

Re: Cool! *NM*

[Joel K.]

Re: Fuel Flow Issue on a '68 327/350

The battle continues. Although I got no leaks after trying Chuck Rice's suggestion to use gasket cement to seal the fuel line connections, now the carb leaks like a sieve. I'm thinking of replacing it with a remanufactured unit -- the one on the car isn't correct -- anyone have any experience with Carbs Unlimited?

Thanks!

[Joel K.]

Re: Fuel Flow Issue on a '68 327/350

The battle continues. Although I got no leaks after trying Chuck Rice's suggestion to use gasket cement to seal the fuel line connections, now the carb leaks like a sieve. I'm thinking of replacing it with a remanufactured unit -- the one on the car isn't correct -- anyone have any experience with Carbs Unlimited?

Thanks!

[Jim T.]

Re: Fuel Flow Issue on a '68 327/350

What kind of carb do you have on your 327/350?

[Jim T.]

Re: Fuel Flow Issue on a '68 327/350

What kind of carb do you have on your 327/350?