Right need some diagnosing a fault on me mates shell suit wearing cavalier (Calibra ) Its a 2.0l 8 valve CAT equipped.

starts not too bad from cold but smells really rich, then a horrible noise starts coming from the fuel pump like its sucking in air and speeding up and slowing down Once warm ish the pump sounds ok for a short period then all of a sudden it will start to howl and the revs go really lumpy and eventually stalls

Tried a different fuel pump with its own dedicated 12v feed, still makes the same noises and symptoms as the old pump, getting plenty of flow and pressure through the pump, reg on fuel rail appears to be working and when vacume pipe kinked you can hear the revs change slightly. There is no pressure drop in the fuel system, nor any leaking injectors.

When it stalls if you leave it five mins or so it will start up, but if you leave the pump running (own dedicated power supply) with the engine off and then try to restart it wont do it, to me suggesting a leaking injector fouling plug(s).

Also had another known working ISCV fitted.

Going to try and swop various sensors and ECU tomorrow

Any help much appreciated

Bri.

 

First gues would be the shitty clotch covered rubber fuel line vauxhall tended to use at that era of cars from the tank to the pump (assuming its an external pump) has a tiny crack in it thats allowing the pump to draw in air.

 

Welcome back Chip

Its had most of the fuel lines replaced but will check this one again. There was an adjustable requlator near the external pump that has been by passed as its goosed. Its fitted after the pump and before the fuel rail, i assume this is just to set the max pressure to reach the rail, then the other reg takes over to adjust the fuel pressure under load?

Also if you leave the engine off but keep the pump running it sounds fine, so would this rule out the faulty pipe?

Bri.

 

you dont want a regulator before the rail on a 8v calibra, im not sure what that would have been.

 

OK that was disconnected and rotton to bits.

Bri.

 

Yea im a vauxhall expert bri!! just tell him to scrap it!!!! LOL !

 

Yeah he might do as its just killed another fuel pump today trying to get her running

Bri.