fuel problem?

[13lazer]

last week when i was coming home from work my blazer started surging about a mile from where i get off the freeway. when i got off the freeway, my truck died about 1/2 mile before i got home. i am getting no gas to my carburetor. i bypassed the fuel filter i bolted to my frame, still no gas to my carburetor. i just pulled my mechanical fuel pump off my motor. (its a small block 383) when i pushed the lever on the pump, gas shot out. i pulled out the fuel pump push rod and it looks fine, the ends are square. it doesn't seem worn down.
my question is, what should i do next? i know i have about a 1/2 tank of gas. is it possible that the cam lobe for the fuel pump wore down?
when i was turning over the motor there was no pushing or pulling from the fuel pump when i put my finger over the fuel line hole.

[cdowns]

if you have the original quadrajet carb there is a fuel filter inside the carb where the gas line goes// that's a good place to check

[13lazer]

it's a holley 670 cfm carb. tomorrow i think i'm gonna use my air compressor and blow air from my fuel line back to my tank. there might be some crap in my gas tank plugging my fuel line.

[Hubscrub]

my truck quit on me like that and i wasn't getting fuel it finally got enough to run to get me home and i pulled the tank and cleaned the lines and the filter was so cloged u couldn't hardly blow through it and it was only on the truck for less than 500 miles, after that it has not missed a beat -just a thought-

[VetteVet]

Run a separate line on the input side of the pump into a can of gas and see if the pump
will pull it out to the carb. Be sure and check your oil level in case the pump diaphragm is ruptured. You wouldn't want gas in the oil. If you take the fuel pump off and have someone turn the engine over while you are holding the rod against the lobe it should move as the cam is turning.

[llowlife]

Cam lobes can go flat...check it

[13lazer]

Originally Posted by VetteVet

Run a separate line on the input side of the pump into a can of gas and see if the pump
will pull it out to the carb. Be sure and check your oil level in case the pump diaphragm is ruptured. You wouldn't want gas in the oil. If you take the fuel pump off and have someone turn the engine over while you are holding the rod against the lobe it should move as the cam is turning.

thanks VetteVet, i used both of your suggestions and determined that the fuel pump was good. then i pressurized my gas tank to get fuel up to the front of the truck. i installed a mr gasket in line filter by my carburetor, and now i'm running again.

[VetteVet]

Originally Posted by 13lazer

thanks VetteVet, i used both of your suggestions and determined that the fuel pump was good. then i pressurized my gas tank to get fuel up to the front of the truck. i installed a mr gasket in line filter by my carburetor, and now i'm running again.

I don't see this as a fix. What happens when the fuel tank gets low and the pressure drops? Are you sure you have a good vent and aren't creating a vacuum as you draw down the fuel. If your vent is plugged that is what would happen and you wouldn't pull any fuel if the atmospheric pressure wasn't constant in the tank. Or you might just have a weak pump. What year is your Burb.?

If that's it in your avatar that answers my question.

[13lazer]

Originally Posted by VetteVet

I don't see this as a fix. What happens when the fuel tank gets low and the pressure drops? Are you sure you have a good vent and aren't creating a vacuum as you draw down the fuel. If your vent is plugged that is what would happen and you wouldn't pull any fuel if the atmospheric pressure wasn't constant in the tank. Or you might just have a weak pump. What year is your Burb.?

If that's it in your avatar that answers my question.

I used air pressure to get the fuel to the front of the truck because i'm parked on a hill and I didn't want to burn up my starter trying to get the pump to suck the gas all the way up to the front of the truck. i think my main problem was that my fuel filter that i mounted on my frame was clogged. i bypassed that filter and installed one up by the carburetor. i am a little nervous that the fuel pump is weak and i'm gonna keep an eye on it. it's a holley pump that i bought at a local hot rod shop. i think it has less than 30000 miles on it. it is the truck in my avatar, it's a 1970 2wd blazer. i don't think the system is sealed.
thank you for taking the time to respond to my questions.