Fuel Filter ??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GMCjunkie · 06-08-2004, 10:02 AM

Only one right?? I have a Rochester Qjet.... on a 350. Theres just the one up on the carb right?? I have someone swearing that there is 2. If so, WHERE?? Thanks
junk

**kwmech** · 06-08-2004, 10:06 AM

Factory just used the one in the carb. I always take them out and put an inline under the cab where the line comes from the tank.

dubie · 06-08-2004, 10:20 AM

I just have the one that is situated between the fuel pump and the carb. I'm not sure if there is another inside a Q jet or not but I know there is one inside the carb on a 1 barrel rochester tho

**JIMs70GMC** · 06-08-2004, 10:46 AM

Should be one inside the carb on a q-jet. Anything else was added.

Bill72BB · 06-08-2004, 11:00 AM

I installed a aftermarket filter between the fuel pump and the cab . with these old trucks there is always a chance of junk in the tank , also the aftermarket is bolted to the inner fender and is easier to change and larger than the one inside the carb .
JMO

Mudder · 06-08-2004, 11:04 AM

Just run the line back to the tank Jodie. You should see it if someone has added one at some time (and the one in the carb).

cdowns · 06-08-2004, 11:06 AM

there is a filter sock thing inside the tank attached to the fuel pickup line

Bowtie67 · 06-08-2004, 02:17 PM

Quote:

Originally Posted by cdowns

there is a filter sock thing inside the tank attached to the fuel pickup line

Yes but id doesn't get changed unless there is a real issue, There is a filter in the carb usually, be careful replacing this, I have seen a lot of guys crossthread these back into the carbs and screwing them up pretty good. I would check to make sure there are no others. It is somewhat common as bill mentioned with these old truck of having another in line fuel filter.

cableguy0 · 06-08-2004, 05:05 PM

i bet your filter sock in the tank looks like sh!t they do clogged corroded and collapse over the years. not a bad idea to replace it because it stops anything big from getting into the fuel line in the first place. i would also add another filter as stated b4 in the rubber hose under the truck

**oldiron** · 06-08-2004, 11:18 PM

When you do take out the filter in the carb make sure that the new one goes in the same way. Some are directional and the truck will run fine upto 50 mph then will go no faster. I learned this the hard way. I did it on my old bosses truck. The next day I was looking for a job. I don't put inline filters the wrong way since. LOL

Johnny Outdoors · 06-09-2004, 12:36 AM

you def want to filter it before the pump with an inline filter
it saves a lot of wear on the pump
and it makes more sense to filter it there instead of at the carb
because the dirt will tear up a fuel pump fast
you can also leave th one in the carb just for extra protection to the carb ports
just my 2Cents

724wdcopper · 06-09-2004, 05:29 AM

learn from my mistake. . . be careful of what kind of flow the fuel filter is capable of. i spent $50 on a huge moroso filter. ran fine for a while, then all of a sudden the engine started starving really bad. couldn't go over 1/8 throttle or up hills.

took everything apart and cleaned it. air flowed thru the filter, fine. replaced electric fuel pump. it was several years old. same problem. high pressure 8-9 psi pump. same problem. check filter again. everything seems fine. try different carb. same deal. third carb. no change. tow truck to dads shop 3 hours away. get professional engine mechanic to take a ride. tell him all about it. he takes it and 15 minutes later, brings it back. runs great! put filter back in quadrajet, took *&^%%$&() moroso off. never had a problem since! three weeks of messing with the damn thing! just never tried it with out the "added" filter!

1-PU70 · 06-09-2004, 09:36 AM

From what I have read for a mech pump the filter goes after it for a elect pump the filter goes before it. Since thats how most cars are built and they spend tons of $ on R&D they must know something.

GMCjunkie · 06-12-2004, 10:54 AM

First, THANKS to everyone for your help/comments.
Second, I traced the lines from the tank all the way to the fuel pump and up to the carb, I only see the one filter at the carb. Is there one INSIDE the fuel pump??
Thanks again

Mudder · 06-12-2004, 11:01 AM

Nope Jodie there isnt a filter in the fuel pump......

Other than the one in the tank (screen) and the one in the carb, that is all you should have unless someone has put one in the line and U have checked that out.... You having problems?

06-08-2004, 10:02 AM	#1
GMCjunkie Dude...I'm a CHICK Join Date: Jul 2000 Location: Lakeland Georgia Posts: 6,192	Fuel Filter ??? Only one right?? I have a Rochester Qjet.... on a 350. Theres just the one up on the carb right?? I have someone swearing that there is 2. If so, WHERE?? Thanks junk __________________ ~~~~~~~~~~~~~* "The unexamined life is not worth living" -Socrates ~~~~~~~~~~~~~* '71 GMC Suburban 4x4

06-08-2004, 10:20 AM	#3
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,853	I just have the one that is situated between the fuel pump and the carb. I'm not sure if there is another inside a Q jet or not but I know there is one inside the carb on a 1 barrel rochester tho __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

06-08-2004, 10:46 AM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Should be one inside the carb on a q-jet. Anything else was added. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

06-08-2004, 11:00 AM	#5
Bill72BB Thats the Hillbilly way Join Date: Jul 2001 Location: Torrance,Ca Posts: 5,979	I installed a aftermarket filter between the fuel pump and the cab . with these old trucks there is always a chance of junk in the tank , also the aftermarket is bolted to the inner fender and is easier to change and larger than the one inside the carb . JMO __________________ BILL Torrance Calif 90504 Member DUF Club Member Old Farts Club 72 3/4ton Custom Camper BB402/400 trans Dynomax Cerama-coat headers , Hei distributor ,Edelbrock 1411 air,ps,pb,leafsprings ,98 chevy 60/40 seat,S10 shoulder belts tilt,3.54 Dana 60 rear. 16" Eagle wheels with LT265/75 16 tires,Gaylord Lid,H4 headlights with 100W relay conversion. " If I knew I was going to live this long I would have taken better care of myself " Marriage changes passion...suddenly you're in bed with a relative. A GUY'S PRAYER.... Lord, I pray for a nympho with huge boobs who owns a liquor store and likes to fish and hunt and has a Harley .Amen ,

06-08-2004, 11:06 AM	#7
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	there is a filter sock thing inside the tank attached to the fuel pickup line __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

06-08-2004, 10:06 AM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,630	Factory just used the one in the carb. I always take them out and put an inline under the cab where the line comes from the tank.

06-08-2004, 11:04 AM	#6
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	Just run the line back to the tank Jodie. You should see it if someone has added one at some time (and the one in the carb).

06-08-2004, 05:05 PM	#9
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	i bet your filter sock in the tank looks like sh!t they do clogged corroded and collapse over the years. not a bad idea to replace it because it stops anything big from getting into the fuel line in the first place. i would also add another filter as stated b4 in the rubber hose under the truck __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

06-08-2004, 11:18 PM	#10
oldiron Designated Grumpy Old Man Join Date: Oct 2001 Location: arlington, washington usa Posts: 3,094	When you do take out the filter in the carb make sure that the new one goes in the same way. Some are directional and the truck will run fine upto 50 mph then will go no faster. I learned this the hard way. I did it on my old bosses truck. The next day I was looking for a job. I don't put inline filters the wrong way since. LOL __________________ Never let the truth get in the way of a good story 71 Chev 1/2 ton 4X4 LWB Fleetside SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=361222 http://www.youtube.com/watch?v=1LgREwtDfaA 68 Chev 1 ton flat bed http://www.youtube.com/watch?v=0bO8szzlD4A 56 Chev Handyman Wagon http://www.youtube.com/watch?v=9y-6ddpBTkM http://www.youtube.com/watch?v=lbLzZ7zY8wA 56 Chev Belair http://67-72chevytrucks.com/vboard/s...d.php?t=410667 http://www.youtube.com/watch?v=xoW0Ei7ZNIg

06-09-2004, 12:36 AM	#11
Johnny Outdoors SOON TO BE A STEP SIDE Join Date: Apr 2004 Location: Little Valley, N.Y. Posts: 169	you def want to filter it before the pump with an inline filter it saves a lot of wear on the pump and it makes more sense to filter it there instead of at the carb because the dirt will tear up a fuel pump fast you can also leave th one in the carb just for extra protection to the carb ports just my 2Cents __________________ 67 CHEVY LONGBED----- BEST 51 DOLLARS EVER SPENT ON EBAY! 4.3 LITER INJECTED MOTOR WITH 5 SPEED GOING IN SOON

06-09-2004, 05:29 AM	#12
724wdcopper graphic designer Join Date: May 2004 Location: Spokane, Washington Posts: 841	learn from my mistake. . . be careful of what kind of flow the fuel filter is capable of. i spent $50 on a huge moroso filter. ran fine for a while, then all of a sudden the engine started starving really bad. couldn't go over 1/8 throttle or up hills. took everything apart and cleaned it. air flowed thru the filter, fine. replaced electric fuel pump. it was several years old. same problem. high pressure 8-9 psi pump. same problem. check filter again. everything seems fine. try different carb. same deal. third carb. no change. tow truck to dads shop 3 hours away. get professional engine mechanic to take a ride. tell him all about it. he takes it and 15 minutes later, brings it back. runs great! put filter back in quadrajet, took *&^%%$&() moroso off. never had a problem since! three weeks of messing with the damn thing! just never tried it with out the "added" filter!

06-09-2004, 09:36 AM	#13
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	From what I have read for a mech pump the filter goes after it for a elect pump the filter goes before it. Since thats how most cars are built and they spend tons of $ on R&D they must know something. __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

06-12-2004, 10:54 AM	#14
GMCjunkie Dude...I'm a CHICK Join Date: Jul 2000 Location: Lakeland Georgia Posts: 6,192	First, THANKS to everyone for your help/comments. Second, I traced the lines from the tank all the way to the fuel pump and up to the carb, I only see the one filter at the carb. Is there one INSIDE the fuel pump?? Thanks again __________________ ~~~~~~~~~~~~~* "The unexamined life is not worth living" -Socrates ~~~~~~~~~~~~~* '71 GMC Suburban 4x4

06-12-2004, 11:01 AM	#15
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	Nope Jodie there isnt a filter in the fuel pump...... Other than the one in the tank (screen) and the one in the carb, that is all you should have unless someone has put one in the line and U have checked that out.... You having problems?

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