On a engine making a true 375-400 hp what diameter fuel line would you need? Is factory 3/8" line enough o should I go to 1/2"? Looking for a stock look, so if i didnt need to rebend new lines, that would save me some time too. If I end u with a 1/2" line , does anyone make a fitting to screw into fuel bowl fitting? Thanks
For a street driven car 3/8" from the tank to the carb is fine. If the car will be drag raced with good traction you may start running into fuel delivery issues on hard runs. At that point a larger suction line may help, but 3/8" would still be fine on the pressure side of the pump (mechanical). Some folks get away with a bit more when it comes to this topic. A lot depends on the distance of the suction line, number of bends, and sump location in the tank. For all the vehicles I've owned over the years, I was fine with stock fuel delivery systems to low 13's in the 1/4 mile. Once changes were made to run much quicker than that, fuel delivery issues had to be addressed. Nearly every vehicle is different, as are the fuel systems. Some folks can run a lot quicker with stock fuel lines and mechanical pumps, others can not. I use and prefer rear sumped tanks, or fuel cells with rear mounted electric pumps for over 450h and pretty fast cars. It just takes one more variable out of the equation when you are trying to make your street car run like a race car on weekends......Cliff
I will be using a Holley Blue 110 electric pump with canister filter mounted in rear of vehicle However ,i wont sump tank for look purposes,but may add 1/2 pickup to pump if necessary? Hoping for low 13 to hi 12 sec times out of this vehicle. Think Pure Stock/FAST type car and thats the look im after without the hidden fuel cell in the stock tank lol Thanks
An electric pump will want to be gravity fed. That is why you see them mounted so low. If you mount it up high, it will have to suck and push, and it will be less effective. If I were you, I'd be looking at a fuel injection tank, or something like the Aeromotive Phantom fuel system. http://www.jegs.com/p/Aeromotive/Aeromotive-Phantom-Stealth-Fuel-System/2433963/10002/-1
Nick, just like they said you should be fine. That Holley Blue pump does a good job, even if mounted higher than tank. I had one mounted above front of tank on back of axle hump for many many years on a daily driven Buick. It is one of the few electric pumps that will do well that way is my understanding. Same car, had the stock tank line feeding the pump, and 1/2" line to the regulator at front of car. Engine was little over 500 hp at the time. This car made hundreds of passes at the track and never had fuel issues. My other car, convertible, still uses stock tank set up, through canister filter in rear, and lines feeding the mechanical pump. Engine is about 450 hp in it, and it has no issues for fuel at the track. So, I would say, based on my experience, it isn't necessary to change out the tank pick up at this point. You should be fine, unless you find otherwise.
My car has run 11.70's with the stock line and S-1 fuel pump,with the car's weight past the 4000 pds with me in it.Bruno.
I've had the same Holley blue pump for the last 20 years using 3/8" lines using the Holley regulator. I played with the pressure on the regulator to get it to the max I could have it without pushing the float needle off it's seat. Once I had it set it's never starved on a full throttle run, which happened on more than one occasion prior to putting the pump in.
Holley blue is fine, regulator required. The only time we've ran into troubles with rear mounted electric pumps is when the pick-up in the tank gets uncovered, which is easier to do than one would think. When you start running that fast, it's time for a sump or fuel cell anyhow......Cliff
