Thames Water have been thwarted in attempts to fix a vital water main because engineers are unable to cut off water to West Middlesex Hospital.
The burst water main in Whitton Dene has been causing traffic chaos for three weeks with vehicles diverted into narrow Kneller Gardens - but no date for the work has yet been set.
And if the work does not go ahead before the Guinness Premiership Final rugby match at Twickenham on May 31 residents say gridlock is almost certain.
Neil Mackenzie, who lives in Kneller Gardens, said: “Coaches on their way to Twickenham have been coming along our road and causing chaos.
“Drivers are getting frustrated and driving up on the pavements - as a father-of-three I am worried that they are going to clip a child.
“Water is just gushing out of this manhole and nothing is being done.”
Thames Water now thinks it has a solution to the challenge of fixing the pipe without cutting off vital supplies to West Mid along with residential areas.
Engineers hope to get the job done in the middle of the night and water tankers will be on standby at the hospital just in case.
A spokesman said: “We had to make sure that water was still going to get to the hospital. Leakage is important but we can't just cut off water to these areas.
“We have tried several different things and none of them have worked, so the engineers are going to try one more method.”
Once the 33 inch pipe is fixed road repairs will begin, and work could go on until mid June.