I HAVE  TWO 86 VETTES. BOTH TIMES I HAD STARTING TROUBLE , I HAD WATER IN MY TANK. THIS IS DUE TO THE LITTLE HOSE THAT LETS THE WATER OUT AT THE GAS CAP AREA. WHEN YOU OPEN THE LID OF YOUR GAS TANK YOU WILL SEE A HOLE ON THE BOTTOM PORTION , BELOW THE GAS CAP.  THIS HOLE GETS CLOGGED UP WITH LEAVES, DIRT, BEES...ETC...  JUST GET A PENCIL OR LONGER STICK THE DIAMETER OF A PENCIL AND PUSH OUT ALL THE CRAP. KEEP IT OPEN AND CLEAN AND YOU WILL HAVE NO PROBLEMS WITH WATER. NOW BUY A HAYNES MANUAL AND THERE IS A EASY METHOD TO GET ALL THE WATER OUT OF THE TANK, LINES AND FUEL RUNNERS TO THE INJECTORS. IF YOUR FUEL PUMP HAS BEEN REPLACED WITHIN A COUPLE OF YEARS, I FEEL THERE IS NO REASON TO GET ANOTHER ONE INSTALLED, INCLUDING THE FUEL FILTER.  TRY IT  KEN PFEIFER  FALCON51@COMCAST.NET   WE NEED ANSWERS TO OUR PROBLEMS AND ANYONE WHO HAS HAD A PROBLEM FIXED LET US ALL KNOW..THE GM MECHANICS ARE NOT GOD'S.  THEY CAN FIX OUR CARS BECAUSE THEY HAVE ALREADY COME ACROSS THE PROBLEM IN A PREVIOUS JOB OR THEY ALREADY HAVE THE ANSWER JUST BY READING AND LISTENING TO FORUMS LIKE THIS ONE. I HAVE HAD MY TWO 86 VETTES FOR MANY YEARS AND HAVE LEARNED TO FIX THEM MYSELF. IT NOT HARD TO DO, YOU NEED THE WILL TO TRY...