In reading back through this thread, I will admit that the possibility of using the gas pump did not occur to me. I have seen what happens when people get burned by gasoline and know how easy it is to ignite. And, it is omnidirectional in its effect.
I do want to explain the rationale for my selection of the Black Widow. It is not the only handgun I own. These range from a NAA Pug (an interesting little gun) to a Blackhawk Bisley in 45 Colt and include, among others a Ruger LCP, several LCRs, a variety of J Frames in 22 LR and 38 Special, a S&W K frame in 357 with 2.5" barrel, some 1911s, a Sig 238, Glock 17, and Sig 250 Compact.
When I thought the scenario through, it ultimately dawned on me that if I don't have something with me, I can't use it.
The finalists on my list were:
NAA Pug in 22WRM
Black Widow in 22 WRM
LCP
Ruger LC9
LCR in 38 Special with Laser
Ruger Super Blackhawk Bisley 44 Mag with 3.5" barrel in a Tanker holster.
All of these I have carried in field while hunting or making rounds at the ranch. The Bisley is a sentimental favorite. It is the most accurate handgun own, but it is bulky, slow to unholster, and difficult to adequately conceal (except when you are wearing a jacket. Thus, it is not practical for daily carry in this urban environment (Denver area).
The LCP and LC9 were carefully considered. I favored the LC9 primarily because of the external safely. DAO provides a measure of safety, but there is something about semiautomatic pistols in my front pocket close to the femoral artery and mending femor that gives me pause. Ultimately, I am simply more comfortable with revolvers.
That left the LCR, Black Widow, and Pug. The LCR (I have 3: 22 LR, 22 WRM, and 38 Special) are nice little revolvers. However, they are fairly bulky and not really that comfortable to carry for me (some surgical scars, etc).
I have good gun leather for the Pug and Black Widow. However, the leather for the Black Widow works much better. It is much more comfortable, and it is easy to bring the Black Widow into action quickly.
The ergonomics of the Black Widow also work for me (a bit better that the Pug) and the gun is very well made and fairly accurate. However it takes a bit of practice, and will never win a speed loading contest. Also, the 22 WRM works a lot better in practice than it does on paper. It is easy for me to control with one hand while standing on one leg and balancing with my cane. Those who have not checked may find the terminal ballistics surprising when compared to the 380.
I do much of my shooting practice with short barreled revolvers in the lead up for deer season. It helps focus my mind on trigger pull and breathing. To some extent this has influenced my selection. For what it is worth, Jeff Cooper was a fan of the 22 WRM in a short barreled revolver for self defense.
Life is full of compromises. This should partially explain my selection of a pea shooter.