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If it is like the b2600i and b2200 it should be right behind the driver kick panel.
Fuel Injected? In the fuel tank
The fuel pump relay is located in the cab near the floor behind the driver side kick panel. The attached links below contain additional information about your truck.
on the firewall passenger side
the fuel pump relay for a Mazda b3000 is under the hood. It is a 15 amp relay in the fuse box.
I have a 1992 B2600i 4x4. It's an automatic. I get about 17mpg on a good day.
It sounds like low fuel pressure could be a real possibility. It could be a partially blocked filter, weak fuel pump or a faulty fuel pressure regulator.
location of fuel pump relay
On a 1988 Mazda 626, the fuel pump relay is located in the fuel tank. Always disconnect the battery before beginning work on a fuel system.
Where can I find the fuel pump relay on a 2000 mazda 323
The B2600i does not have an EGR valve, because the truck is fuel injected the ECU monitors driving conditions and retards ignition timing to lower NOx emissions. Kyrasis6 Mazdatruckin.com
The 1995 Mazda 626 fuel pump relay switch can be found attached to the frame, next to the gas tank. The relay switch should be labeled as such.