I used the Tanks Inc pump and it has a return line port.
I do like the Sniper but am conflicted, was just talking with
@jhynesrockmtn about all this. My 60 with the knockoff Aisin starts and runs awesome but it does suffer when I get into higher altitudes which was a big reason for going Sniper on the 40. I know different jetting could compensate that, which I may start playing with.
I’ve been tinkering with really cold (sub 25 degree) starts the last couple weeks and it’s a lot better. The Sniper is awesome for hot restarts and cold starts the rest of the year when it’s above 40.
Overall I am happy I did it. Would I do it again? I’d probably try a well sorted mechanical secondary Aisin for awhile first. The Aisin I had on this 40 had a ton of issues and I didn’t want to pay for another and was pulled in by the dazzle of efi.
The Sniper is not like a modern car efi, it’s just a really smartish carb. The quirks of it are waiting the 5 seconds every time you start it for the fuel prime and the iac can’t really compensate for really cold temps without needing to use your foot to bump idle up. Also, below 160 degrees coolant temp, the Sniper doesn’t really compensate for anything so a lot of people experience lean spikes and stalling. I’ve learned how to drive it below 160 where I’m not really having these issues. There’s also the ever present thought “I’m screwed if this pump quits” or something, where the stock carb and mechanical pump likely wouldn’t just crap out all at once. Less of a problem if you aren’t too far from home, huge problem way up a FS road in 18” of snow. But in reality, anything can break and leave you stranded.