By , (Corrects that president of Regional Freight Chamber said service stations, not PDVSA, were limiting supply, paragraph 8)VALENCIA, Venezuela/MARACAY, Venezuela, March 7 (Reuters) - V enezuelan state oil company Petroleos de Venezuela has begun rationing diesel to truckers, four transport sector sources told Reuters, as low domestic refining output and scarce imports amid U.S. sanctions squeeze fuel supplies.Frustrated truckers blocked a highway in the central state of Maracay in protest over the shortages on Friday, social media images showed. Industry groups said the unprecedented...…By , (Corrects that president of Regional Freight Chamber said service stations, not PDVSA, were limiting supply, paragraph 8)VALENCIA, Venezuela/MARACAY, Venezuela, March 7 (Reuters) - V enezuelan state oil company Petroleos de Venezuela has begun rationing diesel to truckers, four transport sector sources told Reuters, as low domestic refining output and scarce imports amid U.S. sanctions squeeze fuel supplies.Frustrated truckers blocked a highway in the central state of Maracay in protest over the shortages on Friday, social media images showed. Industry groups said the unprecedented...WW…