stoddart2000

hello ive got a problem with a cavalier 1993 2.0i
weve narrowed it down to do with something electrical with the pump, there is no power getting to it, weve got power to the relay and out of it so thats working fine, the pump is fine.
the car is just turning over and not starting, we connected a battery to the pump its an in tank pump, got the pump going turned it over and it fires up fine and runs. as soon as you disconect and put the proper plug back in it will tick over but try and rev it and it stops.
weve traced the wiring back as far as possible all conectors are fine near the pump and relay.
i carnt find any fuses that have anything to do with it to check.
i can bell out the cables batween the pump connector and the ones under car but not belling out from that connector to relay is there something inbetween that could be stopping it.
it looks like the car did have an alarm fitted standard. there is sensors above the door, in the bonnet there is a few wires at the backto the right that look like they could have been connected to an alarm.
the car was working fine for weeks since bourght and then one day just stopped going along a straight road at 30.
any help would be great. thank you for your time
im an electrician, but not clued up on auto electrics at all i should do a course on it to leard some basics

SafeChav

When you disconnect the battery from the pump and connect the proper plug back up......is the pump still running?!

stoddart2000

no ive tested at the plug at the pump and there is no power getting to that plug at all, thanks for your help

SafeChav

There can only really be a break in the wire then if you say there is power out of the relay but not at the pump.

Does the car drive ok if you run wires to the pump?

stoddart2000

we havent tried driving it but ive been told your not ment to put permanent power onto the pump because it can burn it out so only powerd it up for a bit at a time. i think it would drive fine though.
ive put a post on another site and a lot of people are going on about an inertia switch, in the back wheel arch? would anyone know where this is located and what it looks like to check?
vauxhall cavalier 1993 2.0i
cheers

Wardy257

Just run a new line from the relay to the pump.

stoddart2000

im not clued up enough on car electrics to know where to take it from, with the relay out thers power to 2, with it in and ignition off thers power to 3, with ignition on thers power to 5, and when you try start it the 6th one gets power to it.
i would be guessing
thanks for the help

SafeChav

I would of said inertia switch if it was a ford, i didn't know vauxhalls had them

And as for putting power to the pump, it makes no odds?!!! Who told you that. As long as theres fuel in the tank so the pump isn't running dry it will be fine?!

Almost like they are saying the power coming out of another battery is different?! Jokers!

stoddart2000

got an auto electrician having a look tonight so hopefully got to the bottom of it, ill let you know

SafeChav

stoddart2000

auto electrician been round it looks like some plonker who had the car before has made a diy cut off for the fuel pump, he diddnt find out where the switch was but noticed the wiring had been tamperd with, connected the main wires back together and it fired up straight away, simple as that lol
oh well glad its running
thanks for the help everyone

SafeChav

I said there would be a break in the wire

At least your running again And i hope it didn't cost you much