i have a non greasecar conversion which i have modified a lot anyway.
it is a 6.2 L '91 chevy g20 van.
let me get to the point.
in the summer, i drove all over the place. i went from san diego to western massachusetts by way of wherever i felt like going. in mass, i was given a holley blue pump to use as an experiment, and to make the changing of filters wicked easy (used to take half an hour doing some perhaps inadvisable compressed air fuel pushing, now it takes a few minutes and is safe). i use the holley blue to bypass the stock lift pump when using veggie, which allows me to put my selector valve inches from the IP, thus making switchover incredibly fast and efficient.
recently, a friend of an acquaintence asked for help in a conversion. at first, i thought i would suggest using a holley blue, but then i started checking out online forums to see what others think about it. it seems that folks think holley blue's 15 psi is too little to pump by itself. now, i drove 3,100 miles with my holley blue doing all the work, but i wonder if maybe there is something going on i don't know about.
possible goings on are: 1. maybe the stock pump, which is mechanical, and continues to pump at all times, is really still pushing some fuel through the selector valve, and i am actually burning a bit of diesel - though the return home trip had pretty much the same veggie consumption as the trip out when the list pump came after the selector. 2. maybe i am killing my holley blue by asking it to do too much. 3. maybe i am killing my IP by asking it to do too much. 4. maybe i am going to blow a hose by having my mechanical pump continually pumping into a closed selector input (i thought a remedy for this might be a second holley blue to replace that pump altogether).
does anyone have any insight into this matter?
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