First, I'm very sorry to hear about your husband. I hope all is well with you.
Next, a regulator won't cause this to happen, so don't spend anything on that. If the fuel pressure regulator was bad, you would either have low pressure (would not run) or too high (black smoke from exhaust or flooding problem). Regardless, the regulator allows excess fuel to return to the tank. Thus, the fuel isn't burned and wouldn't affect the MPG.
Is the engine running good? Does it have the same power it always had? Has the check engine light ever come on?
Let me know.
Joe
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Thursday, April 8th, 2010 AT 10:28 AM