Quote:
Originally Posted by jhein
I don't know but people have suggested that even if I don't have any obvious starvation, it's still happening. I don't know if that only matters for someone who is racing or if would have any noticeable effect in a street only car like mine. So you are running a mechanical pump? I had you pegged for a in-tank guy.
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The starvation issue usually only happens at the dragstrip with good traction/hard launch, with a better robbmc mech pump it usually takes low 12's or into 11's & faster to show the starvation... on the street the tires break free and you lose that highj G force that causes problems with a mech pump sucking fuel through almost 20ft of curved & bent lines. If all you ever do is run the car on the street with no drag strip time, you most likely wont see the starvation problems and your 3/8 line will be ok.
Quote:
Originally Posted by jhein
OK, both Mallory and Holey tech support say that their pumps (Mallory 110 and Holley red) will not allow the mechanical pump to pull fuel through them if they are off or if they fail. That seems to contradict what people have said here, at least for the Holley. I don't know which is correct but if they won't allow the mechanical pump to pull fuel through in the event of a failure then that's a no go. My intention would be to run it at all times, not just start up.
So now I'm back to either living with the limitations of the mechanical pump, which are not terrible, or going in-tank electric. I was on the verge of doing that a couple years ago but I soured on the idea. One of the reasons was because people advised that you should have the low oil pressure safety switch. I agree that seems like an important part of the system. But people said that the currently available switches were poor quality and not reliable. That really turned me off. But, when the fail, do they fail open or closed?
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Did you see the link to the carter pump I posted? Should allow fuel flow even when off or failed according to what Ive read over the years from people that have used it as a primer/pusher pump... and its a lot cheaper piced that the others mentioned that may or may not flow when failed as their techs explained.
If you want to go the pusher pump route, the carter elect pump is probably the best bet for what you want... but going with the tanks inc set up allows for future upgrades to EFI and will supply the q-jet much better than a mech. But again for a pure street car, all that may be overkill if all you want is to fix a hard start issue after sitting awhile and dont have any drag racing or auto crossing plans. A primer/pusher pump fixes that for under $100 vs well over $1000 for intank set up.
https://www.summitracing.com/parts/crt-p4070