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Chevrolet Repair/Passenger sending unit

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Question
QUESTION: Does my 1979 gmc sierra grande passenger tank have 2 or 3 line sending unit. its gas and has a 20 gallon tank.

ANSWER: HI KEVIN, I WILL NEED TO LOOK THIS ONE UP AT MY WORK FRI MORNING. WHAT ARE YOU DOING AND WHY DO YOU NEED TO KNOW THIS JUST SO I UNDERSTAND WHAT IS GOING ON ??? NOT BEING NOISEY..BECAUSE IT HAS 2 TANKS IT MAY HAVE 3 LINES. MAIN,VAPOR RETURN AND CROSSOVER TO THE OTHER TANK..JUST A HYPOTHESIS..GET BACK TO ME AND I WILL LET YOU KNOW FRI AM..TOM

---------- FOLLOW-UP ----------

QUESTION: I changed fuel pump and it wouldn't start so after sitting for a few weeks I tried it  again and oot started. Well I have a little hole in my passenger tank so I'm buying. new one cause its rusted inside. There's no driver side tank on  
That's how I bought it. So not sure if I need 2 or 3 line sending unit

Answer
HI KEVIN,,WELL IF YOU ONLY HAVE ONE TANK JUST GET A SENDING UNIT FOR 1 TANK ONLY. THIS HAS A CARBURETOR SO FUEL INJ DOES NOT COME INTO PLAY. USUALLY A SINGLE TANK HAS 1 LINE TO IT UNLESS THIS YEAR HAS A VAPOR RETURN LINE...WHICH WOULD BE EASY TO CK. JUST LOOK AT THE LINES GOING UP TO THE FUEL PUMP..IF 2 LINES TO THE LOWER SECTION OF PUMP THEN YOU HAVE A VAPOR RETURN LINE AS WELL AS THE MAIN FEED LINE WHICH WILL BE 3/8 " AT THIS POINT I WOULD GET THE CHEAPEST SENDING UNIT YOU CAN GET WHICH WILL BE THE SINGLE LINE OR 2 LINE. I WOULD ALSO RUN NEW COPPER LINES UP TO THE FUEL PUMP TO MAKE SURE THEY ARE CLEAN..LET ME KNOW HOW THIS WORKS OUT FOR YOU..IF YOU NEED MORE INFO GET BACK TO ME..TOM..

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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.

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