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I just noticed there is a sending unit, could my sending unit be clogged or damaged? Gas is being poured down my tank and is probably just sitting there.
There is an inlet screen on the sending unit. It can get clogged. You might be able to shine a light in your tank and see it. Also, the "S" shaped rubber hose between the frame rail and the fuel pump is a specific molded Corvette part. If you use plain-old hose, it can get kinked and block flow.
Is your car elevated and level? If you are on ramps, the fuel pump may be above the level of the fuel, and nothing will flow out. You may also need to apply suction to get anything started. Gasoline is involved, and much danger, so I am hesitant to advise you to do something dangerous. But this should be pretty easy to diagnose. Just be prepared for the worst case (fuel tank dumps contents into wherever you happen to be), and mitigate your risk (do this outside, with fire safety in mind, etc).
There is an inlet screen on the sending unit. It can get clogged. You might be able to shine a light in your tank and see it. Also, the "S" shaped rubber hose between the frame rail and the fuel pump is a specific molded Corvette part. If you use plain-old hose, it can get kinked and block flow.
Is your car elevated and level? If you are on ramps, the fuel pump may be above the level of the fuel, and nothing will flow out. You may also need to apply suction to get anything started. Gasoline is involved, and much danger, so I am hesitant to advise you to do something dangerous. But this should be pretty easy to diagnose. Just be prepared for the worst case (fuel tank dumps contents into wherever you happen to be), and mitigate your risk (do this outside, with fire safety in mind, etc).
My car is elevated but only the front half of the car as I thought the reason my car wasn't firing was because the fuel pump was not pumping gas to my car. Hence the front half of the car is elevated because I had to swap my fuel pump. Turns out that the fuel pump was probably not the issue, rather it is the fact that there is no gas coming into the fuel pump from the tank.
How do I clean the screen on my sending uniy which can get clogged? Do you think that is the issue as to why there is no fuel pouring out from my tank to the inlet hose at the fuel pump?
Or is it because the car is elevated? I poured enough gas to the point where the tank should be relatively full where the elevation to the front of the car wouldn't matter. Also when I removed the rubber inlet hose in the beginning of the process to swap my fuel pump, I'd say a good cup of fuel poured out of the hose. Hence eliminating the elevation issue.
My car is elevated but only the front half of the car as I thought the reason my car wasn't firing was because the fuel pump was not pumping gas to my car. Hence the front half of the car is elevated because I had to swap my fuel pump. Turns out that the fuel pump was probably not the issue, rather it is the fact that there is no gas coming into the fuel pump from the tank.
How do I clean the screen on my sending uniy which can get clogged? Do you think that is the issue as to why there is no fuel pouring out from my tank to the inlet hose at the fuel pump?
Or is it because the car is elevated? I poured enough gas to the point where the tank should be relatively full where the elevation to the front of the car wouldn't matter. Also when I removed the rubber inlet hose in the beginning of the process to swap my fuel pump, I'd say a good cup of fuel poured out of the hose. Hence eliminating the elevation issue.
So you never tried starting the car with all 4 wheels on the ground?????
So you never tried starting the car with all 4 wheels on the ground?????
The reason I began this process is because the car wasn't starting with all 4 wheels on the ground. I changed the choke to an electric one then changed the ignition coil with all 4 wheels on the ground, tried getting the car to fire and nothing. Then removed the fuel line from the carburetor the fuel pump, pressed the gas pedal and no fuel came out, all with the car on all 4 wheels.
THEN I elevated the car and began removing the fuel pump and it has been elevated since.
The reason I began this process is because the car wasn't starting with all 4 wheels on the ground. I changed the choke to an electric one then changed the ignition coil with all 4 wheels on the ground, tried getting the car to fire and nothing. Then removed the fuel line from the carburetor the fuel pump, pressed the gas pedal and no fuel came out, all with the car on all 4 wheels.
THEN I elevated the car and began removing the fuel pump and it has been elevated since.
What does pressing the gas pedal have to do with getting fuel out of the line?
you may have a line full of air at this point with the nose pointing up.
Put the car on the ground. Step on the gas pedal once to set the choke and start the car. If it doesn’t start after 10 seconds step on the gas pedal 3 times to prime the carburetor and try starting the car.
Op
be safe as mentioned..open space etc..
take some clear pictures of fuel pump and hoses.
get a safe for gasoline container..see if fuel flows from the large line from the tank to the pump with car somewhat level.
a cup of fuel is NOTHING..it will pour out pretty fast thus the caution.
if ok then reconnect, verify no pinched hoses, remove steel line from carb and crank for 30 seconds and measure fuel in a safe container.
report results..
grab a drink and take a look at this thread and gas and required flows and pressures. Not same year but most similiar for seeing the filters and in the tank at the filter etc. https://www.corvetteforum.com/forums...e-on-road.html
What does pressing the gas pedal have to do with getting fuel out of the line?
you may have a line full of air at this point with the nose pointing up.
Put the car on the ground. Step on the gas pedal once to set the choke and start the car. If it doesn’t start after 10 seconds step on the gas pedal 3 times to prime the carburetor and try starting the car.
Don't you have to step on the gas pedal in order to have fuel travel from the pump to the fuel bowl in the carburetor in order to prime the carb? If you remove that line from the carburetor and step on the gas pedal and no gas comes out of that line that is supposed to come out to prime the carb, doesn't that mean your fuel pump is bad OR there is no fuel traveling to your pump at all. I did all this with all 4 wheels on the ground. There obviously was no gas getting to the carb.
I have yet to try this process with the new fuel pump installed so I will drop the car tomorrow and try it again but as of right now, there is no fuel coming to the rubber "S" hose that is in between the line on the frame rail and the fuel pump when I poured gas into the tank. It should have flowed out of that hoes unless something was clogging it not allowing it to get through. I poured a lot of gas as well. All this gas must all be collecting in the tank and not going further.
No you don't have to step on the pedal for the pump to work, just to set the choke and once gas is in the carburetor to prime the carburetor. After changing the pump the car should be on the ground to prime the pump.
No you don't have to step on the pedal for the pump to work, just to set the choke and once gas is in the carburetor to prime the carburetor. After changing the pump the car should be on the ground to prime the pump.
Ok will do that tomorrow, do I have to attach the line that goes from the pump the carburetor? becuase at the moment with my new fuel pump, it isn't fitting and I need to tweak it a little in order to get it to fit in the pump. I rather test that the new pump I've purchased is working and good to push fuel out by seeing if fuel leaves that hole.
Pull the carburetor off and put something like a clean empty plastic 1 gallon water or milk bottle over the steel line sitting on it's side.
Connect the steel line at the pump and tighten...
You may need to sit the car back on the ground.
Go ahead and crank the starter over in short 15-20 second bursts or until you see fuel entering the bottle.
Let the starter cool some between bursts.
It may take several tries but if the pump is working you will get fuel.
If the steel line needs a "little" tweaking connect the steel line hand tight into the carburetor before bolting it down.
You may have to adjust the brass 90* elbow at the pump to get it at a better angle at the carburetor.
Then massage the carburetor and gasket into place and bolt it down.
Finish tighten fuel lines both top and bottom.
Yes there is a fuel strainer sock on the suction side (3/8" line) of your 77 sending unit.
It sits just off the bottom of the fuel tank.
No you don't have to step on the pedal for the pump to work, just to set the choke and once gas is in the carburetor to prime the carburetor. After changing the pump the car should be on the ground to prime the pump.
Attached all the lines to and out of the pump, brought the car down, I set the choke, cranked it a total of 4 times still no gas going to the engine. Now what?
I really didn't think that the reason the line from the tank to the fuel pump wasn't pouring out fuel when i poured fuel into the tank was because the car was tilted up. Like I said I poured a lot of gas into the car. It should have still been able to pour out of that "S" hose when I poured the gas into the tank. (Unless like i mentioned there is something being blocked in the tank not letting the fuel travel to the pump in those lines.) The nose wasn't even tilted all that high up. So now that I have attached everything and brought the car down and I am still in the same situation. Any ideas now?
Pull the carburetor off and put something like a clean empty plastic 1 gallon water or milk bottle over the steel line sitting on it's side.
Connect the steel line at the pump and tighten...
You may need to sit the car back on the ground.
Go ahead and crank the starter over in short 15-20 second bursts or until you see fuel entering the bottle.
Let the starter cool some between bursts.
It may take several tries but if the pump is working you will get fuel.
If the steel line needs a "little" tweaking connect the steel line hand tight into the carburetor before bolting it down.
You may have to adjust the brass 90* elbow at the pump to get it at a better angle at the carburetor.
Then massage the carburetor and gasket into place and bolt it down.
Finish tighten fuel lines both top and bottom.
Yes there is a fuel strainer sock on the suction side (3/8" line) of your 77 sending unit.
It sits just off the bottom of the fuel tank.
I went ahead and did all this and there is still no gas getting to the fuel pump. I really think its something to do with something blocking the fuel in the tank where it is supposed to leave into the lines to the pump. Let me know now what to do.
Do you have a rentals store in your area?
One that may rent for a day a small compressor, something that will build at least 60psi. Something like this is fine LINK:https://www.harborfreight.com/air-to...sor-57572.html
Jack car back up, siphon as much gas back out of the car as you can, your going to have to do that if tank removal is necessary anyways.
Pickup a spray nozzel and male quick disconnect fitting at Loews, home depot or harbor freight like this one...rubber tip. LINK:https://www.harborfreight.com/blow-g...tip-63577.html
Remove fuel cap and rubber "S" shape fuel line (3/8") and blow back through steel line to tank.
If you can hear air blowing back into the tank reconnect all fuel lines, add fuel and try again.
That's my only advice other then dropping the fuel tank..
Is the sender on top? If so, unless the line is charged, fuel may not flow.
OP, do you have a Mityvac to start the flow? Safety rules still apply, be ready to clamp the line, AND be ready to deal with an entire tankful of gasoline.
The fuel pump will pump fuel, but I'm not so re it works to pull a vacuum.
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