1970 Malibu 350- quadrajet has no fuel filter?? - Chevelle Tech
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post #1 of 17 (permalink) Old May 25th, 18, 1:08 PM Thread Starter
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1970 Malibu 350- quadrajet has no fuel filter??

Hello forum-
I disassembled my QJ fuel line hoping to replace the fuel filter and I was surprised to see no filter. I removed two rubber o-rings a washer and a beveled washer. Take a look at the attached pics and let me know if anyone is familiar with this type setup, and should there be a filter?
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post #2 of 17 (permalink) Old May 25th, 18, 1:47 PM
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Re: 1970 Malibu 350- quadrajet has no fuel filter??

Looks like a "repair" part that a previous owner installed when the threads in the carburetor were stripped. Based on your photos, you should install an inline filter and replace the O-rings on that adapter/repair part. A replacement carburetor may be your best bet! Looks like this is what you have>

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post #3 of 17 (permalink) Old May 25th, 18, 2:38 PM Thread Starter
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Re: 1970 Malibu 350- quadrajet has no fuel filter??

Thanks Dave that is what I have. I need to get the replacement o-rings since mine are torn and add an in-line filter since the repair won't allow for a carb filter. I hate to replace the carb since it's original to the car.
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post #4 of 17 (permalink) Old May 25th, 18, 3:05 PM
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Re: 1970 Malibu 350- quadrajet has no fuel filter??

Just offering a suggestion. I would mount a metal fuel filter at the tank or near the tank. When I see rubber line and clamps near the carb. I get worried, WHY?
After many heating and cooling cycles, Rubber hoses MAY crack and MAY leak. That could be why Chevrolet used a solid METAL line to the carb. from the fuel pump.
The see through filters ( glass & plastic) and other kinds that use rubber hoses are NOT a good idea around any type of heat.
Bottom line is stay safe. A fuel leak on your engine or near the Carb. at 50--60 MPH. It is NOT,,,,, For the most part a " Happy Outcome ". Think about it?
HEY,,, Its your car, Do what you think is good for you and your car.
Bob
P.S.
On my 70 468 driver and my one owner 70 SS 454/ M-22 I have metal filters at the tank. WHY? I do NOT want to keep taking the Q-Jet apart to change filters, Paper or Stone.
I do not want to get into the problems that you can have by working on the old Q-Jets. I have NOT touched my two Q-Jets in years. Change the filter at the tank and you are good to go! This is just something to think about!
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post #5 of 17 (permalink) Old May 25th, 18, 4:16 PM
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Re: 1970 Malibu 350- quadrajet has no fuel filter??

You can also put a filter between the main line and the fuel pump inlet. The inlet part with the 2 o rings at your carb is a repair part.

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post #6 of 17 (permalink) Old May 25th, 18, 4:20 PM
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Re: 1970 Malibu 350- quadrajet has no fuel filter??

NAPA part # FIL-3033 is your friend here.
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post #7 of 17 (permalink) Old May 25th, 18, 5:22 PM
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Re: 1970 Malibu 350- quadrajet has no fuel filter??

Should be able to have somebody Helicoil it.

Jim

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post #8 of 17 (permalink) Old May 25th, 18, 6:35 PM
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Re: 1970 Malibu 350- quadrajet has no fuel filter??

Quote:
Originally Posted by neaswa View Post
Hello forum-
I disassembled my QJ fuel line hoping to replace the fuel filter and I was surprised to see no filter. I removed two rubber o-rings a washer and a beveled washer. Take a look at the attached pics and let me know if anyone is familiar with this type setup, and should there be a filter?
Attachment 557825

Attachment 557833
Did it leak with that setup? If it didn't I'd put it back together and leave it alone with A filter of some sort. The only issue you'll have with putting an inline filter in is that you'll have to cut a section out of your fuel line to put the filter and hoses on it. I guess you can put a filter back at the tank, but I've always understood that filters on the suction side of the fuel pump aren't a good idea. That said, if this is just a cruiser, and you DON'T want to cut a section of fuel line out on the carb end, it might be OK to do that.

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post #9 of 17 (permalink) Old May 26th, 18, 1:56 AM
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Re: 1970 Malibu 350- quadrajet has no fuel filter??

Great shot of the 1970-71 style choke pull off with the unique finger.

Someone, somewhere, put some thought in the design.!!

Thanks
Randy
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post #10 of 17 (permalink) Old May 26th, 18, 4:00 AM
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Re: 1970 Malibu 350- quadrajet has no fuel filter??

Back in the day the first thing we would do was pull that filter and throw it away and install an inline filter. The "experts" told us those Quadrajet and Holley inlet filters were restrictive and would plug up easily, then bypass and dump the crud they were holding back into our carbs.
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post #11 of 17 (permalink) Old May 26th, 18, 4:50 AM
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Re: 1970 Malibu 350- quadrajet has no fuel filter??

What Jim said. there's several carb shops that can install a helicoil in there. It's a mill operation, not something done by hand or in a drill press. I recall seeing that it was like $75, well worth it for an original carb.
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Last edited by Tom Mobley; May 26th, 18 at 10:51 PM.
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post #12 of 17 (permalink) Old May 26th, 18, 3:08 PM Thread Starter
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Re: 1970 Malibu 350- quadrajet has no fuel filter??

Thanks for all of the feedback. It didn't leak until I took it apart and tore the o-ring. I see that Quadrajetparts.com sells a 7/8-20 self tapping inlet fitting with oversize threads that essentially restores the original setup. Although I do like the idea of a helicoil since I could then use an original style inlet fitting. The car is mostly original so I'm trying to preserve as much as possible without getting crazy.

Has anyone had experience installing a self tapping inlet fitting for a repair?
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post #13 of 17 (permalink) Old May 26th, 18, 10:59 PM
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Re: 1970 Malibu 350- quadrajet has no fuel filter??

That self-tapping fitting deal is tough. you have to have it perfectly straight and keep it straight. If it gets crooked at all you're in trouble. it won't seal on the original sealing washers and it won't be fixable with a heli-coil anymore, even in a mill.. When it cuts threads all the pieces end up in the filter housing where they wash directly into the needle/seat and on into the carb. You'll need to plan on pulling the carb and cleaning it like a rebuild, IMO.

Trouble is, if stuff gets caught in the needle/seat and the carb floods over you're very close to finding out if your fire insurance is really any good.

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post #14 of 17 (permalink) Old May 26th, 18, 11:02 PM
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Re: 1970 Malibu 350- quadrajet has no fuel filter??

why don't you just put new o-rings on the repair fitting you're got? put a metal can 3/8 filter in the hose between the frame and the pump. Change it yearly and you'll be fine.

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post #15 of 17 (permalink) Old May 26th, 18, 11:12 PM
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Re: 1970 Malibu 350- quadrajet has no fuel filter??

I would pass on the self tapping fitting, send that carb out and get it helicoiled by a reputable machine shop as this carb has value to you. When you get it back, don't put a filter in it. Install an inline filter and leave the fitting alone. (my $.02)
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