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Chevrolet Repair/81 c10 fuel system problem

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Question
QUESTION: My truck has new distributor plugs wires rotor button carb fuel pump filter and sending unit i believe it may be the fuel evap system that has no vacuum to it that is the problem tell me what u think

ANSWER: HI MIKE,WHAT IS THE PROBLEM..THESE OLDER TRUCKS HAD A CHARCOAL CANISTOR THAT IF THE VACUUM VALVE WENT BAD IT WOULD REMOVE FUEL FROM THE CARB AND GET TO A POINT OF FLOODING..BUT TELL ME WHAT IS GOING ON.I KNOW MANY PEOPLE JUST REMOVED THE CANISTORS..TOM

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QUESTION: The truck idles fine drives great up untill high gear then it stops pumping gas to the carb after this happens the truck almost cuts out and goes back to its idle speed and u can tell the fuel isnt pumping as much and after a while it starts pumping perfect again again all the fuel system component are brand new

Answer
HI MIKE, I DO NOT THINK YOU HAVE A PROBLEM WITH THE VENT VALVE. BUT IF YOU WANT JUST REMOVE THE HOSE GOING TO THE FLOAT BOWL AND PLUG IT FOR NOW..OK LET ME ASK YOU THIS THE HOSE FROM THE SENDING UNIT TO THE STEEL GAS LINE BY THE TANK. HAVE YOU CHECKED THIS HOSES AND ALL THE OTHER HOSES TO MAKE SURE THEY ARE OK AND NOT COLLAPSED, THEY MAY LOOK GOOD FROM THE OUTSIDE BUT WHAT YOU ARE TELLING ME IS WHAT SOUNDS LIKE FUEL STARVATION..IF ALL THE LINES LOOK GOOD AND I ALSO WANT YOU TO CK THE FUEL FILTER [I KNOW IT IS NEW] BUT IF IT PICKED SOMETHING UP IN THE LINES THIS COULD CAUSE THIS PROBLEM..SO LETS SAY THE LINES AND FILTER ARE OK,MY NEXT STEP WOULD BE TO CK THE FLOAT LEVEL,THIS MAYBE TO LOW NOT ALLOWING ENOUGH FUEL TO KEEP THIS ENG RUNNING AT HIGHER SPEEDS AND RPM'S..THIS IS A 4 BRL ???  THESE REBUILD CARBURETORS ARE NOT WHAT THAY USED TO BE..ONE LAST THING IS THE CHOKE SPRING SET CORRECT SO IT IS NOT CLOSING THE CHOKE AFTER WARMING UP.THIS WOULD CAUSE FUEL STARVATION AS WELL..LET ME KNOW HOW THIS GOES,GET BACK TO ME..GOOD LUCK,,,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.

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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

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MANY CUSTOMERS IN OUR BUSY SHOP.

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