The fuel cooler is on the return side of the system. There won't be fuel there unless the pumps make it to system pressure. Take the line off at the inlet side of the fuel dist. There is a screen in the inlet fitting and I have seen them plug up but it is rare. It is more likely that if the pumps can't get fuel through the pressure regulator then the pumps are bad. If so replace both.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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