I just changed the fuel pump on my 98 Isuzu Rodeo and now it wont start. The pump is getting power because i can hear it humming. Fuel is getting to the fuel rail, I checked the the shrader valve. I tested the battery and its fully charged but it wont start. Im stumpped, can anyone help?

Bad replacement fuel pump? is there a gas filter that might need attention?

The way the pressure goes to 45 then drops to ten might indicate a forward leak in the fuel pressure regulator. Could also be a bad check valve in the fuel pump but you’ve already changed that.

I dont think the pump is bad and the filter was changed recently. Ill have to check the pressure before the filter to see if the pressure stays To eliminate the regulator. Ill have to check the valve too, I only changed the pump not the whole assembly to due to the fact that for the 98’s the3 ecm ha…

Can you check to see if the injectors are getting juice to fire?

Did it start before you changed the fuel pump? Why did you change the fuel pump?

Make sure the fuel injectors are pulsing as oldtimer mentions.

Even if the injectors are pulsing it won’t run with only 10 psi fuel pressure.

Just curious, do you have a check engine light? If so it can help figure out the problem. I think AutoZone has a reader you can rent

No I havent checked for a CEL but ill check that and the injectors

Changed fuel pump and now it wont start

Power/Fuel

seagates5 March 25, 2015, 8:02am 10

I had to change the pump because it had failed, no pressure or electrical humming.

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Changed fuel pump and now it wont start

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