Car had been sitting up for approx a year before I bought it. Wouldn't run. Changed fuel pump and cleaned lines to make it run. Quit running. Installed another new pump and it ran OK at first then started running erraticaly and quiting when gas went down to 1/4 tank. Installed a new pump and now does the same at approx 1/2 tank. Have run no fuel pressure checks. Installed one new filter at beginning of problem and a new air filter. Don't know where to go next.