GFI Pressure Regulator Question

[oldgeeezers]

Does anyone know the difference between a GFI Pressure Regulator Model # P32-100 and a P32-900? My ford ranger has a P32-900 and I think it's going out. Will only start when it's warm. I found a P32-100, is there any reason that won't work?

Thanks in advance for your help!!
Kevin