Fuel Problem, '73 Blazer

[Jcizmadia]

I've been rebuilding my 73 Blazer for about 2 years now and after getting the body fixed up, I finally was able to start working on the engine.

Its having trouble getting fuel from the tank to the engine, even though I just replaced the fuel pump and filter filter, and got the carb rebuilt.

Could this be a problem with the sending unit?

 

[nvrenuf]

Probably just need to start the siphon effect on the line. I’ve used air to push it forward before, just be careful not to use too much pressure.

 

[MEMO43]

Are the lines new, any kinks or sharp bends that coukd restrict flow.
Can you get the engine running, when you turn the engine over the mechanical pump only draws enough fuel to start the engine.
After that the fuel pump rod takes overs an acts like a plunger of sorts to get the diaphram working.
Try the trick as mentioned by nvrenuf.
Once you have fuel delivery ir "should" be easier to diagnose

 

[Kain]

check the rubber line about half way under the truck on the fuel line to see if its bad also

 

[aceroth]

Could be the sending unit but it can also take forever to pull enough gas through the line to fill the bowl. If you have a mech fuel pump, hook a hose to the inlet side of that straight into a gas can. Get it started, run it for a bit to get it hot and the bowl full then go back to the line to the tank

 

[diesel4me]

The "sock" filter in the gas tank can get coated with ethanol gunk and restrict fuel flow too...especially after sitting a long time..

Usually filling the carb's float bowl up with gas thru the air vent will let it start and run long enough to prime the fuel line between the tank & pump..

Some GM trucks had a section of rubber fuel hose joining metal lines near the rear tire on the frame rail--I've had them collapse inside,yet look perfect outside,and cause a lot of fuel feed related grief till I replaced it and cut the old hose open to do an autopsy--it was like black bubble gum inside,all gooey...evidently hose not rated for ethanol or oxogenated fuel..

A pin hole on the top side of the metal line somewhere can let air get sucked in and not suck the gas to the pump,and it wont always leak at that spot,especially if it is located on top of a bend in the tubing..