1978 Fuel Filter
Le Mans Master
Joined: Aug 2003
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From: Chattanooga TN
Race Director
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From: Smalltownville Michigan
Cruise-In 5, 6 & 10 Veteran
St. Jude Donor '09
if not, i'm sure the little kids in the neighborhood will hear some really cool words because you either took the boss fitting out of the carb or craked the housing! lol
Tech Contributor
Joined: Aug 1999
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From: At my Bar drinking and wrenching in Lafayette Colorado
There is only one filter in the system, and it's the filter in the carb. You do not want to add any in-line filter in addition to the in-carb filter. NAPA Gold part number 3052 for the "long" filter used 1975+, and part number 3051 for the "short" filter used 1966 through 1974.
Once you get the filter out, using a 1" backup wrench on the inlet nut and a flarenut wrench on the line tube nut, be sure to lubricate the tube nut threads and the back side of the tube flare with some bearing grease. This will assure proper re-torque and a leak-free connection without over-tightening the parts.
Lars
Once you get the filter out, using a 1" backup wrench on the inlet nut and a flarenut wrench on the line tube nut, be sure to lubricate the tube nut threads and the back side of the tube flare with some bearing grease. This will assure proper re-torque and a leak-free connection without over-tightening the parts.
Lars
Last edited by lars; Oct 15, 2019 at 12:49 PM.
Cruising
Joined: Nov 2019
Posts: 10
Likes: 0
From: South Florida
There is only one filter in the system, and it's the filter in the carb. You do not want to add any in-line filter in addition to the in-carb filter. NAPA Gold part number 3052 for the "long" filter used 1975+, and part number 3051 for the "short" filter used 1966 through 1974.
Once you get the filter out, using a 1" backup wrench on the inlet nut and a flarenut wrench on the line tube nut, be sure to lubricate the tube nut threads and the back side of the tube flare with some bearing grease. This will assure proper re-torque and a leak-free connection without over-tightening the parts.
Lars
Once you get the filter out, using a 1" backup wrench on the inlet nut and a flarenut wrench on the line tube nut, be sure to lubricate the tube nut threads and the back side of the tube flare with some bearing grease. This will assure proper re-torque and a leak-free connection without over-tightening the parts.
Lars
I see you stated not to have an additional in-line filter along with the in-carb filter, is it due to restricting fuel flow or a drop in pressure ?
Curious as my 72 has a clear aftermarket fuel filter attached to the fuel line before the carb filter.
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Le Mans Master
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From: Myrtle Beach SC
Tech Contributor
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From: At my Bar drinking and wrenching in Lafayette Colorado
- There is simply no need for two filters. Why install unnecessary parts?
- Yes, I have seen multiple instances where high rpm fuel starvation problems have been caused by 2 filters having been installed in the system. The worst offenders are in-line filters installed on the suction side of the mechanical engine-driven fuel pump - these will cause problems even if there is no in-carb filter.
- Aftermarket in-line fuel filters installed between the pump and the carb usually involve cutting the stock steel fuel line and installing rubber fuel hoses on the pressure side of the system. Not only does it look bad, but it's not always safe. There is a reason GM went to the trouble and expense of making steel hard lines on the pressure side of the system. Particularly unsafe are those clear glass/plastic filters - many cars have been lost to those filters...
Lars
Little-known fact tid-bit:
Did you know that if someone sabotages your car by putting powdered sugar in the gas tank, the Q-Jet in-carb paper filter element will actually filter out the sugar and prevent it from getting into the carb and into the engine? The filter will plug up nearly solid, and the engine will exhibit fuel starvation symptoms. But the engine and carb will not be damaged if the stock in-carb filter is used.
Last edited by lars; Nov 11, 2019 at 01:03 PM.
Melting Slicks
Joined: Feb 2017
Posts: 3,232
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From: PHX AZ
Lars....BTW thanks for all you do!
Little-known fact tid-bit:
Did you know that if someone sabotages your car by putting powdered sugar in the gas tank, the Q-Jet in-carb paper filter element will actually filter out the sugar and prevent it from getting into the carb and into the engine? The filter will plug up nearly solid, and the engine will exhibit fuel starvation symptoms. But the engine and carb will not be damaged if the stock in-carb filter is used.
I'm an older guy...'we' have always been told that that 'sugar/gas' thing was an old wives tale. Insofar that Sugar does not dissolve in Gasoline. The 'true' part is sugar dissolves in the WATER that may or may not be in the gasoline. This seems 'truer' now-a-days with the ethanol fuels we use...Ethanol absorbs PRODIGIOUS amounts of H2O.
Unkahal
Little-known fact tid-bit:
Did you know that if someone sabotages your car by putting powdered sugar in the gas tank, the Q-Jet in-carb paper filter element will actually filter out the sugar and prevent it from getting into the carb and into the engine? The filter will plug up nearly solid, and the engine will exhibit fuel starvation symptoms. But the engine and carb will not be damaged if the stock in-carb filter is used.
I'm an older guy...'we' have always been told that that 'sugar/gas' thing was an old wives tale. Insofar that Sugar does not dissolve in Gasoline. The 'true' part is sugar dissolves in the WATER that may or may not be in the gasoline. This seems 'truer' now-a-days with the ethanol fuels we use...Ethanol absorbs PRODIGIOUS amounts of H2O.
Unkahal
Last edited by L-46man; Nov 11, 2019 at 02:22 PM.
Tech Contributor
Joined: Aug 1999
Posts: 14,369
Likes: 6,361
From: At my Bar drinking and wrenching in Lafayette Colorado
That's correct. It doesn't dissolve in the gas. Because it doesn't dissolve, it goes into suspension and floats around in the gas tank, getting sucked into the fuel system. This powdered sugar, if it gets past a larger-pore fuel filter, really mekes a mess out of the fuel system and the carb. I've worked on some cars where this has happened. If you have the stock in-carb filter, you only have to flush out the tank and the lines. If it gets into the carb, it gets messy...
Cruising
Joined: Nov 2019
Posts: 10
Likes: 0
From: South Florida
There are 3 reasons:
The "tank sock" is more of an inlet "screen" than a filter. It prevents larger particulate, like rust flakes and dirt from the tank, from entering the fuel pump. Small pieces of dirt and rust flakes will jam the fuel pump check valve, which causes total loss of fuel pressure.
Lars
Little-known fact tid-bit:
Did you know that if someone sabotages your car by putting powdered sugar in the gas tank, the Q-Jet in-carb paper filter element will actually filter out the sugar and prevent it from getting into the carb and into the engine? The filter will plug up nearly solid, and the engine will exhibit fuel starvation symptoms. But the engine and carb will not be damaged if the stock in-carb filter is used.
- There is simply no need for two filters. Why install unnecessary parts?
- Yes, I have seen multiple instances where high rpm fuel starvation problems have been caused by 2 filters having been installed in the system. The worst offenders are in-line filters installed on the suction side of the mechanical engine-driven fuel pump - these will cause problems even if there is no in-carb filter.
- Aftermarket in-line fuel filters installed between the pump and the carb usually involve cutting the stock steel fuel line and installing rubber fuel hoses on the pressure side of the system. Not only does it look bad, but it's not always safe. There is a reason GM went to the trouble and expense of making steel hard lines on the pressure side of the system. Particularly unsafe are those clear glass/plastic filters - many cars have been lost to those filters...
The "tank sock" is more of an inlet "screen" than a filter. It prevents larger particulate, like rust flakes and dirt from the tank, from entering the fuel pump. Small pieces of dirt and rust flakes will jam the fuel pump check valve, which causes total loss of fuel pressure.
Lars
Little-known fact tid-bit:
Did you know that if someone sabotages your car by putting powdered sugar in the gas tank, the Q-Jet in-carb paper filter element will actually filter out the sugar and prevent it from getting into the carb and into the engine? The filter will plug up nearly solid, and the engine will exhibit fuel starvation symptoms. But the engine and carb will not be damaged if the stock in-carb filter is used.
I actually do have an choking issue when approaching high RPM, most likely a inline filter. Will be replacing all the lines soon as I will be moving to a new frame.
Thanks Again, Spencer
