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How do you diagnose a possible fuel pump problem on an 87 Ford Ranger 4x4?
Wiki User
∙ 12y ago
Working on Fords most all my adult, I can tell you from my knowledge
that you should hear the tank pump hum at key on. For about 5 secs.
There is another high pressure pump on the frame just about
where the drivers seat is. In my years in a no fuel pressure situation
99% of the time the culprit is the tank pump. This is the low pressure
priming pump for the high pressure pump on the frame rail.
In order to diagnois this problem you will need to put a pressure gauge
on the fuel rail where the line goes to the injectors. The fitting on the fuel rail
looks the same as the one on a tire. I am assuming your truck is fuel injected
but in 1987 carbs were still around.
Wiki User
∙ 12y ago
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