LAX83FA205

As the acft was climbing thru about 400 to 500 ft AGL, after takeoff, the eng began losing power. The plt turned on the fuel boost pump & started a turn back toward the arpt. When he realized that he could not reach the rwy, he elected to land on a street. During the apch, the acft collided with telephone lines, then crash landed in the street. Before coming to rest, the left wing of the acft struck a vehicle. During an investigation, aprx 1 pint of water & other contaminants were drained from the left wing fuel tank. The right wing tank contained minor foreign contaminants. The fuel selector was found positioned to the right main wing tank & its screen contained extensive foreign contaminants. The eng driven fuel pump inlet line, carburetor inlet line, & carburetor filter screen contained water & other foreign contaminants. There was evidence that corrosion particles had collected in excess of a year & that the fuel strainer & valve had not been inspected for over a year.