1987 6.9 IDI Losing Prime Overnight

Grumpy bruce

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Still have the water separator on it ? If it is motorcraft it might be bad.when I first got my 87 f 350 in 1990 I chased air intrusion for two weeks. Changed to after market one it's been fine since.
330,000 on her still running good. Banks sidewinder at 200000.
 
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