bonecrrusher

First thing I am going to do - is pull the alternator and get it checked out. I've already PM'd Brett at Billet Tech on an alternator setup.

You are correct - the Inlet of the pump is at the top of the pump.

You know that is totally possible - after Googling multiple ECS setup install pictures - looks like the inlet of the pump always installed on the bottom.

Good thing I'm getting pretty good at cutting up PTFE hose - and installing these fittings.

If the alternator is indeed bad - I'll order the replacement olives, more hose, and get this thing flipped over - while I'm waiting for the alternator to get here.

_Wayne_

I agree with the placement of the pump being off. I would get it as low as possible, Ideally where it can be gravity fed up to the pump. I had a similar issue with my external pump setup. I thought it was power related, but it ended up my internal pump was just failing. replaced it with a 450l and all is good.

CHR89

Agreed, thats why I wanted to see what it did if he ran the pump full time where it wouldn’t need to suck fuel up hill on the hit.

bonecrrusher

Hello everyone - its been a little while but I finally had time to work on the Vette.

1st update - I removed the alternator and had it tested 3x - it passed all their tests under load and was told it is still good.

2nd update - I did a test launch - fuel pressure dropped. I stopped and tripped the secondary pump (DW Fuel Pump) to run full time.

I did another test launch - and the fuel pressure was at 70 psi and dropped to 50-55 psi - so again - with both pumps running it dropped ~20 psi.

I do not know the exact fuel pressure it dropped down because the test road I was on is abandoned and it got super sketchy - lol.

3rd Update - my PFTE olives should be in later this week - and I am going top disassemble the external pump - flip it - and put it back together.

I will do another round of tests - 1) Hobbs switch plugged in and 2) the fuel pump tripped to run full time - and I will report back the results.

Thanks.

bonecrrusher

Oh also want to note - DIC was indicating around 13 volts at idle with one pump running - and around 11 with both pumps running.

Thanks.

CI GS

Looking at your photo again, I think there’s three things that you need to change that will solve your problem, because I’m pretty sure that what you are experiencing is the pump losing prime and cavitating. Firstly, I would replace that tiny filter on the inlet side with a larger high flow filter, because I’m pretty sure that is causing a restriction. These kind of pumps don’t pull very well, so they need free flow and no restriction on the inlet side. Then I would rotate the elbow so that it’s horizontal rather than pointing upwards, which may require you to replace it with a 120 or 150 degree like the ECS kit uses, so that it hugs the corner of the tank for clearance. Finally, as I had said before, flip the pump over so that the inlet is on the bottom.
I’ll bet you a six pack of beer that’ll solve your problem.