Hi, i changed my caravans fuel pump but now the car runs but if the car has 1/4 tank of gas if the car is on flat terrain no problem but if the car is up hill or down hill the engine stars to run bad and if i press the gas pedal it detpnats at the admision and if the car has 1/2 the engines trys to work good.
The only dtc its P1495 a small leak detected i changed the purge selenoid of the canister.
Could somebody help me please.

 

Sounds like the fuel pump is not positioned to pull fuel from the bottom of thank. In other words, it runs out of fuel at 1/4 tank. Did the purge solenoid fix the p1495 problem?