JACO

1980 MUSTANG 441? 4108 PERKINS ...HAVING A PROBLEM HOLDING PRIME OVER A FEW HRS. , HAVING TO BLEED PUMP AND LEAVE LINE LOOSE TILL IT STARTS...THEN IT RUNS FINE TILL I LEAVE IT SHUT DOWN FOR A FEW HRS. ? AND REPEAT BLEEDING? CHANGED ALL FILTERS AND A LINE BUT STILL THE SAME? LIFT PUMP, LINES, INJ. PUMP? NO VISIBLE LEAKS. ANY IDEAS... ANY WAY OF CHECKING BLEED DOWN ???