Parallel or dead head?

[ss dave]

For those of you with EFI, which would you recommend as a delivery system and why? Does one have clear advantages or is it application specific. Thanks

[XcYZ]

I'm running dead head. Easier to package, less potential for heating the fuel, etc.

[ss dave]

Thanks Scott I believe your system is very similar to mine. I did a search on this subject on another forum and it was a 6 page discussion which included Jody and Steve. However that was almost two years ago. I was wondering if they had any more info that could help.
Scott what injector size, PSI , and tank do you currently have? Thanks

[XcYZ]

Fuel system plumbing will always cause a lot of discussion.

I'm running the stock LS7 40lb injectors at 60psi. I have a Rick's tank with a Walbro 255 pump. When I don't run out of gas, it works great.

[ss dave]

I'll have a pressure drop when cornering with just 6-8 gals consumed from a full tank. It is the narrowed Ricks tank with a supposed 16 gal vol. I'm now thinking it could be my pump and pick-up.
Scott, I assume that when you say "run out of gas" you mean empty or close to it.
Do you have any issues with the dead head system and pressure drops at WOT?

[camcojb]

Originally Posted by ss dave

I'll have a pressure drop when cornering with just 6-8 gals consumed from a full tank. It is the narrowed Ricks tank with a supposed 16 gal vol. I'm now thinking it could be my pump and pick-up.
Scott, I assume that when you say "run out of gas" you mean empty or close to it.
Do you have any issues with the dead head system and pressure drops at WOT?

I run a dead head system, have on the last few cars I've built. I have no pressure drop issues at all, dead steady. However, if the tank gets low enough (depending on cornering forces or acceleration rates) it will move away from the pickup and you'll see the pressure fluttering and dropping. That is not a return style or returnless issue, that's a fuel pickup issue.

A separate surge tank will eliminate this; even if the tank flutters a bit you have a separate 1-2 gallon tank that's always full to draw from. Works great in drag racing and road racing. I still think this could be incorporated inside one of Ricks tanks which would be the ultimate setup. I need to call those guys and see if they're up for trying it.

Jody

[XcYZ]

I ran the car out of gas on the Power Tour. I dropped the tank later this summer and checked it out, wondering why it wouldn't pick up gas when there was several gallons left. The sock/pickup was on the bottom, but the return hardline came back into the tank parallel to the pump/pickup. It was pointing directly at the bottom of the tank, between 1" to 1.5" to the side of the sock. I suspect what happened was once the level got pretty low, the returning gas was cavitating what was already in the tank. I took a tubing bender and turned and return hardline so it no longer pointed at the bottom of the tank and away from the sock. I haven't had a problem since, but I've been really careful about not getting really low on gas and always keeping an eye on the fuel pressure gauge.

[ss dave]

Scott, I talked with Hector at Ricks yesterday and discussed the issue. It is not a system design problem, ie. parallel or Jerry Garcia (just thought of that and couldn't resist-sorry ). He had something very similar to my situation happen to another setup. They retro fitted the tank with a Bosch pump (330 lph); no problems after that- even on an extended trip thru the curvies. Apparently the A1000 pushes alot of fuel and will suck dry quickly on low volumes. He warned me of this initially-should of listened.

[Steve1968LS2]

Originally Posted by XcYZ

I'm running dead head. Easier to package, less potential for heating the fuel, etc.

I dead head into the fuel rail and have never had an issue.

In fact.. the Z06 and the ZR1 both dead head. It's simpler to package and at our power levels very reliable.

[ss dave]

Thanks Steve,
Sent PM