Originally Posted by bcredliner

I would not be surprised at all if the problem is fuel delivery. I have never even implied it isn't. And I acknowledge the replacement MAF got rid of the dash warning. But since the mechanic had diagnosed the problem as the MAF and the symptoms did not change and since, as I understand it, OP purchased a used MAF, I think it prudent to confirm the MAF is working properly before moving on to troubleshooting for a fuel delivery problem, close out the possibility of one potential cause before moving to another. If I had said, it sounds like, it appears, it seems to me or I think which are often used in place of assume, I wouldn't have left myself open for criticism. Just as I assumed the mechanic knows what he is doing, it is an assumption that the mechanic did not. When there is more than one problem that can cause the same symptoms we all make assumptions from the input provided to come to our conclusion. Too often there is a race to be right or folks get defensive when there conclusion appears to be challenged or does not become the focus of troubleshooting. I have no problem if the MAF is assumed to be fixed and the focus becomes a fuel delivery issue.

It is not conclusive the fuel pump is bad if your engine quits running at a quarter tank or so. It could be a problem with the fuel level sensor instead of the pump.