1968 Q Jet fuel filter

[Mike W.]

Can anyone tell me if a 1968 427/390 Quadrajet has an internal fuel filter where the fuel line screws into the carb? After taking the line out I noticed there was no filter. It does have the larger external fuel filter. I used to own a base engine 71 that had the little internal filter at the carb, but I don't remember it having the larger external filter. Thanks

[Dale C.]

Re: 1968 Q Jet fuel filter

Just this external in line one I think, but Jo L said there was one in carb also.
Dale

[Floyd B.]

Re: 1968 Q Jet fuel filter

I don't know if '68 is any different but the '69 AIM, UPC L36 / A3, pg 365 shows part # 3933107 Pipe Asm-Upper as being attached to the carburetor with no reference to a filter.

[Joe L.]

Re: 1968 Q Jet fuel filter

Can anyone tell me if a 1968 427/390 Quadrajet has an internal fuel filter where the fuel line screws into the carb? After taking the line out I noticed there was no filter. It does have the larger external fuel filter. I used to own a base engine 71 that had the little internal filter at the carb, but I don't remember it having the larger external filter. Thanks

Mike------


There was a carb inlet filter in addition to the external in-line filter (i.e. GF-432). Originals were often a sintered bronze material. Replacements are a paper element with metal end caps.

[Joe L.]

Re: 1968 Q Jet fuel filter

I don't know if '68 is any different but the '69 AIM, UPC L36 / A3, pg 365 shows part # 3933107 Pipe Asm-Upper as being attached to the carburetor with no reference to a filter.

Floyd------


The inlet filter was part of the carburetor assembly and thus was not installed at St. Louis.

[Floyd B.]

Re: 1968 Q Jet fuel filter

I wonder how they kept it from falling out of the carb. Is there also a spring? My car currently has a later service replacement carb installed with the inlet filter and I seem to recall there being a spring that keeps the filter pressed against a journal so that the fuel doesn't simply flow past the filter. Here is a picture of a 215 carb with a 2498 date code showing the inlet filter location. Notice the "FILTER" lettering. I forgot that I had these pics.

West Whiteland-20120218-00087.jpg

[Joe L.]

Re: 1968 Q Jet fuel filter

I wonder how they kept it from falling out of the carb. Is there also a spring? My car currently has a later service replacement carb installed with the inlet filter and I seem to recall there being a spring that keeps the filter pressed against a journal so that the fuel doesn't simply flow past the filter. Here is a picture of a 215 carb with a 2498 date code showing the inlet filter location. Notice the "FILTER" lettering. I forgot that I had these pics.

[ATTACH=CONFIG]53562[/ATTACH]

Floyd------


The filter is retained by the fitting (nut) which threads into the float bowl. There is a spring which installs between the filter and the filter housing in the float bowl.

Not all Q-Jets have the "filter" embossment on the float bowl but all I know of have the filter.

[Floyd B.]

Re: 1968 Q Jet fuel filter

I mean how did they keep it from falling out during shipping since the pipe/nut assembly wasn't present to keep it in place. I would assume a piece of tape or perhaps a threaded plug.

[Joe L.]

Re: 1968 Q Jet fuel filter

I mean how did they keep it from falling out during shipping since the pipe/nut assembly wasn't present to keep it in place. I would assume a piece of tape or perhaps a threaded plug.

Floyd------


The tubing nut is not required to ensure the filter remains in place. The fitting (nut) which threads into the float bowl is all that's required. With the fitting, which is part of all Q-Jet assemblies, installed there's no way the filter can get loose.

[Mike W.]

Re: 1968 Q Jet fuel filter

Thanks guys I appreciate it.

[Stuart F.]

Re: 1968 Q Jet fuel filter

Believe sintered bronze filter is backed by a spring rated to release (push back) when a certain pressure is present due to a clogged filter, I.e. Pressure relief valve function.

Stu. Fox