Just put a engine in a arostar was running good but the fuel pump wouldn't work changed it also relay pump won't work unless you put a jumper on does any one kno w what could be the problem?

Most older fords will have an enertia "impact" switch that is designed to cut all power to fuel pumps in the event of an accident. Middle 80's to early 90's the switches were located on the passenger side floor board underneath the dash. Later model 90's had the swith located in the trunk.

Also you might want to look for a fuel pump relay on the passenger side inner fender under the hood. It should be a five wire harness plugged into a green plastic square shaped relay. I am assuming that your aerostar has a 3.0 liter V6.

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