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Ford did a half year change on the fuel pumps on that Explorer meaning anything that was made up to 3-1-04 was one kind of pump (30-40 psi) and from 3-2-04 and after was a different style pump (60-65 psi). So, check the production date on the door jamb.

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8y ago
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8y ago

When testing the fuel pressure, the key/on engine off reading should be 56-65psi, with the engine running it will vary, with idle being around 35-42psi.

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Q: What is fuel pressure on 2004 4.0 explorer?
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