I got a 79 pickup with a 400 engine. I noticed that the clear fuel
filter fills with gas, then goes nearly dry and fills again (while
engine is running). Is this normal? Shouldn't the filter be
constantly filled? I also have a problem where the truck acts like
it's going to die from a lack of gas, particularly under load and on
hills. I am wondering if the fuel pump may be weak..... ????
The carb was rebuilt about a year ago, and is tight to the block with
no vacuum leaks, since I just replaced all the vacuum hoses.
Whether I rev the engine, or it's at idle, that filter tends to fill
and empty regularly.