Date: Thu, 16 May 2002 21:38:09 +0100
From: "Roger Hyde" <>
Subject: Re: Why does the Anti-lock light go out when petrol goes in

"Roger Hyde" <> wrote in message news:_xBE8.2942$ > I have a problem with the ABS on my newly aquired '92 CS Carlsson. The > "anti-lock" light is mostly on and in the 2 weeks that I have had the car > has gone out on 2 occasions... both of which have been when I have just put > petrol in the car. Has anyone else experienced this... Has anyone got any > theories (other than coincidence) or am I just going mad ? > > Attempts to re-create the forecort experience (short run followed by 5 > minute stop followed by short run) have not had the same effect. > > I have booked the car in at the dealer tomorrow to have the codes read... > but as the anti-lock light isnt showing now (just filled up -silly me) will > he still be able to diagnose the problem ? > > Is there some possible electrical fault (dash-related/ low fuel related) > fault that could cause this. The abs and low fuel lights havent been wired > together by a "bodger" as they do operate independently when I first turn > the key. Could a splash of petrol be washing over the sensor or something ? > or is there another explaination ? The plot thins... I have however managed to reproduce the scenario by timing my fill-up times and driving exactly the same sequence. My theory is that there is a pressure leak in the pump somewhere (not in the fluid as I am not losing any). The ABS system loses pressure quickly (even overnight needs a full pressure re-charge) this then registers as a fault in the ABS ECU. I drive a few miles and the system re-charges, then after a short stop before the system has leaked all its pressure I start up again and the ECU says all is well. An overnight stop ... the pressure is lost and the problem returns I guess the next questions are does the theory sound viable ? Is there a way to fix the pump (seals or something) If I seek out a second hand one are the abs pumps fitted to later 9000s (93 on when I think ABS is standard) the same as my 92 Carlsson How do I fit the pump... does it need priming etc.

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