At his maiden roadshow here, Kejriwal claimed he was in possession of a letter purportedly written by Modi recently to the Centre, asking for such a hike.
"The motive behind hike in prices of gas by three times was to extend benefit to Ambani as he owns wells of oil," he said adding that "by hiking gas prices the cost of fertilisers too will increase and this will lead to inflation and ultimately Ambani will be benefited."
The roadshow, lasting around five hours, was to garner support for AAP candidate Gul Panag. Kejriwal took a dig at both BJP and Congress accusing them of working for Ambani. "Both Modi and Rahul use aircraft of Ambani to travel... they extend benefits to Ambani," he said.
Sharpening his attack against Ambani, he claimed that the industrialist funded both Modi and Rahul during polls.
Hitting out at the BJP's prime ministerial candidate, he said that there was no Modi wave in the country. "I have travelled several places...I didn't see Modi wave ...this illusion is a creation of media," he said.
On Modi's decision to contest from two seats, he said, "This shows he is afraid and not confident of winning polls."
He also accused Haryana Chief Minister Bhupinder Singh Hooda of "acquiring lands of poor farmers" and giving it to Ambani and Vadra (son-in-law Sonia Gandhi).
"I raised the land scandal involving Vadra 18 months back," he said questioning as to why BJP refrained from raking up the issue.
Hooda government was in news last year for alleged allotment of land in upscale regions of the state, including Gurgaon, favouring Vadra.
Referring to alleged use of money during polls, he said "they will come with blankets, money and liquor... don't take liquor as its bad for health...keep money, blanket, but vote for AAP."
On Gul Panag, who was also standing in the vehicle along with Kejriwal, the AAP convener said "besides a celebrity, Panag is also an active social worker."
Kejriwal also advised Panag to stage 'dharna' against him if he gets diverted from his path.
During Kejriwal's roadshow, his enthusiastic supporters broke all traffic rules. Majority of two wheeler riders were seen without helmets with police looking as mute spectator.
Kejriwal arrived here from Haryana where he was on a road show since Friday.
After his road show in the Union Territory, Kejriwal entered into Panchkula in Haryana on his way to Panipat and Sonipat where he will culminate his three-day electioneering for the upcoming general elections.
A large number of police personnel were deployed along the Kejriwal's road show route to avoid any untoward incident.