Contour Enthusiasts Group Archives Forums General Troubleshooting Fuel Rail Pressure Sensor??????????

Did you put the right pump? Bat has a return type and a returnless.
Return type: Fixed speed (fixed voltage, constant output)
Returnless: Variable speed (Varying voltage, varying output)

The returnless pumps vary speed to vary pressure. The earlier systems used a mechanical pressure regulator.

If the pump is putting out too much pressure and not varying, you could be over pressurizing the rail, causing the sensor to read a presuure higher than it can read.

A guess, but if the pump is staying at one speed, and the PCM lowers voltage to lower pressure, the pump, instead of slowing, may cut out at the lower voltage. Then when the pressure drops, the voltage goes up, the pump comes back on full speed instead of a lower speed and overpressurizes the rail.

you know thats funny b/c i was just wondering that same thing the other day. i thought that they may have sent me the wrong pump. i mean he sent me the wrong tie rod end after i told him repeatedly it was for the driver side and he still sent me the passenger. f*&^ing idiots. i need to find a way to check which pump i have. it looked just like the stock one i pulled out. any clues there? i may just call them and see if they have record of what they sent me.

ok so here's the update on the tour.......i had to pick it up from the shop friday and the guy told me he thought he may have a solution but i didnt want to go for it due to the extreme cost and possibility it wouldnt fix the problem. he told me what he thought was the problem and i went from there. i was told by the company i purchased the pump from that the screen on the pump would be fine to install even though it didnt match the factory one. well turns out that screen cut the pump psi in 1/2 literally. it dropped me down to about 18-20 psi and the mechanic said i was needing about 40-42 psi to run. well i took the pump out and took the screen off, put it back in, reset the computer and cranked her up and she's perfect!! no CEL and she's running stronger than ever! the guy from BAT said they should be getting the L shaped screens in sometime this month or next and then i'll be good. until then im running w/just the screen on the bottom since i wasnt able to salvage the old screen. moral of the story is that if it doesnt match 100% to the part being replaced, may be best not to install it. but for now she's back up and running and turns out the CEL was on just due to the lack of psi running through the fuel rail.