E85 conversion installation tips – page 8 – lightning forum lightningrodder.com

In my experience, unless you are running a large single pump or planning to exceed 850-900 rwhp on Ethanol, -8an is as large as you need to go without seeing the extended cranking time needed for priming the lines. The priming time for -8an is measurable, and as the electrical demands continue to rise it becomes advantageous to run only a single small pump up to a predetermined boost level with the second one coming on later into boost. Running only a single 300 lph pump will extend the priming time running any larger sized line. I’m a bit of a perfectionist, so for most, the extended cranking wouldn’t bother some individuals I’d imagine.

I’m also all for overbuilding systems, but for what I would deem "average builds" or builds under 850 rwhp, -8an lines are more then sufficient on ethanol. Lots of variations possible with fuel systems. I remember when I was told way back when that I was crazy to run anything less then a -12an feed and three pumps! For the record, I’m running only one DW300 pump until the second one comes on at 7psi. I’ve logged sufficient fueling on one 300lph pump all the way up to 16psi.

In my experience, unless you are running a large single pump or planning to exceed 850-900 rwhp on Ethanol, -8an is as large as you need to go without seeing the extended cranking time needed for priming the lines. The priming time for -8an is measurable, and as the electrical demands continue to rise it becomes advantageous to run only a single small pump up to a predetermined boost level with the second one coming on later into boost. Running only a single 300 lph pump will extend the priming time running any larger sized line. I’m a bit of a perfectionist, so for most, the extended cranking wouldn’t bother some individuals I’d imagine. I’m also all for overbuilding systems, but for what I would deem "average builds" or builds under 850 rwhp, -8an lines are more then sufficient on ethanol. Lots of variations possible with fuel systems. I remember when I was told way back when that I was crazy to run anything less then a -12an feed and three pumps! For the record, I’m running only one DW300 pump until the second one comes on at 7psi. I’ve logged sufficient fueling on one 300lph pump all the way up to 16psi.Are you turning on the second pump manually?

In my experience, unless you are running a large single pump or planning to exceed 850-900 rwhp on Ethanol, -8an is as large as you need to go without seeing the extended cranking time needed for priming the lines. The priming time for -8an is measurable, and as the electrical demands continue to rise it becomes advantageous to run only a single small pump up to a predetermined boost level with the second one coming on later into boost. Running only a single 300 lph pump will extend the priming time running any larger sized line. I’m a bit of a perfectionist, so for most, the extended cranking wouldn’t bother some individuals I’d imagine. I’m also all for overbuilding systems, but for what I would deem "average builds" or builds under 850 rwhp, -8an lines are more then sufficient on ethanol. Lots of variations possible with fuel systems. I remember when I was told way back when that I was crazy to run anything less then a -12an feed and three pumps! For the record, I’m running only one DW300 pump until the second one comes on at 7psi. I’ve logged sufficient fueling on one 300lph pump all the way up to 16psi.I’m not sure if you maybe have other issues causing extended cranking time with 8AN lines, but I’ve never experienced any noticeable cranking time on any of my builds, or trucks that I’ve wrenched on, varying from 8AN feeds, to 10AN feeds, to twin pumps, triple pumps, or big single pumps. The pumps prime before you even get the key turned forward to cranking and in that split second they’re essentially primed where it makes zero difference on crank time. Also the walbro style pumps usually hold fuel pressure when off anyway making it a moot point, but even with my weldon that does not hold FP when off, and big 12AN to pump and 10AN to Y, it’ll fire right up. heck watch the vid I just posted you can hear it fire right up and it’s not even fully tuned yet lol