You are here:

Chevrolet Repair/78 C10 fuel sending unit lines

Advertisement


Question
Hi there my name is Andrew and I have a question about a 78 Checy c10 delux with a 350 5.7L V8 and Auto trans.  I have replaced the gas tank and sending unit identicle to the one that was on the truck originally and I cannot find where the second smaller line that comes out of the sending unit hooks back up to.  I have the fill line in and the air vent for the fill line in and have hooked up the the larger line out of the sending unit back to the hard line that goes to the fuel pump.  For the life of me I cannot find where the second smaller line connects to the truck. It is connected to the sending unit. Thank you for your time.

Answer
HI ANDREW, THE OTHER SMALL LINE MAY GO TO THE THE FUEL PUMP UNDER THE MAIN 3/8 LINE.. DOES YOUR  FUEL PUMP HAVE ONE LINE OR 2 LINES COMING OUT OF IT ???? IF IT HAS 2 LINES THEN THE SMALL LINE SHOULD GO TO THAT..THAT IS THE RETURN LINE.. IF YOUR PUMP ONLY HAS ONE LINE THEN THIS SMALL LINE IS JUST A VENT THAT SHOULD GO TO A LINE ON THE FRAME RAIL WITH A CK VALVE AT THE OTHER END..A LOT OF THESE TRUCKS DID HAVE A SMALLER 5/16 OR 1/4"..WE KNOW IT IS NOT GOING TO A EVAP SYSTEM,TRUCK IS TO OLD FOR THAT..SOME OF THESE VENTS WENT INSIDE THE HOOD AREA..LIKE A BIG BLACK PLASTIC CHARCOAL CANISTER.CK ALONG YOUR FRAME RAIL FOR ANY BROKEN METAL LINE,IF YOU FIND ONE THIS IS WHERE THIS LINE GOES...LET ME KNOW HOW THIS GOES. IF NO GO, GET BACK TO ME..GOOD LUCK,,TOM...  

Chevrolet Repair

All Answers


Answers by Expert:


Ask Experts

Volunteer


TOM SHEETS

Expertise

PLEASE READ ALL OF THIS BEFORE ASKING ANY QUESTIONS. IF THIS CHEVY SECTION IS MAXED OUT.YOU CAN REACH ME IN THE OLDS/BUICK SECTION. Will answer questions from 6:00am to 10:00pm all days [EST][[[ NO DIESEL OR PAINT QUESTIONS]]] will answer all 1965 to present QUESTIONS ON ALL GM'S on mechanics of these cars. Keep in mind i am not there in person i am going on what you are telling me !! PLEASE IF ASKING A QUESTION GIVE ME AS MUCH INFO AS POSSIBLE. THE MORE THE BETTER. SUCH AS YEAR,MAKE,MODEL,ENGINE SIZE. THIS WILL HELP ME HELP YOU. I will not be able to answer all questions because of some situations that i would really need to be there and see things for myself,such as electrical issues. In many cases i would need wiring diagrams. I can also give you an estimate on what the cost would be at our repair shop as an idea to help you. Keep in mind that my answer is ONLY MY ADVICE,ck with your mechanic as well.. >> THANK YOU, TOM..

Experience

I have been a ASE certified master mechanic for over 30 years and certified IN ALL 8 CATEGORIES,[engine repair,engine performance,auto trans,manual trans,clutches,steering and suspension,brakes,electrical systems,heating and air/cond. I am also a state CERTIFIED inspector for over 30 years. I do computer work [pcm]fault codes,pcm flashing,state inspection monitor readiness,repairs on exhaust,fuel service,[injection and carburetor,] charging system problems, running issues,alignments,frame problems,tire balance,struts and of course standard and anti-lock brakes.

Organizations
nys state auto repair industry and ase group.

Publications
N/A

Education/Credentials
high school,4 years of tech school,and many many hours of auto training with many gm classes and aftermarket training classes..

Awards and Honors
ASE MASTER TECH CERTIFIED IN ALL 8 CATEGORIES.NYS INSP LICENSE AND A/C CERTIFIED

Past/Present Clients
MANY CUSTOMERS IN OUR BUSY SHOP.

©2016 About.com. All rights reserved.