Think I need a 2nd fuel pump?
 

So I got around to thinking about my fuel system again as we are about ready to fire up the motor for the first time in 2+ years. I originally had the A1000 external pump with the stock tank, but switched it out for a nice Rick's tank with in-tank Bosch pump. I never really checked the specs on the pump until now and I have a few questions/concerns.

I have the 044 pump per Hector at Rick's, but I just noticed it is rated up to 685-700 hp. I am now concerned since my motor already dyno'd at 700 REAR WHEEL hp.

Will I be running at the dangerous edge of not enuf fuel here? I know a lack of fuel is not a good thing for a forced induction motor.

I am thinking it might be a good idea to add a second 044 pump inline between the tank and the fuel rails.

Thoughts?

weldon pumps.
rick k

700 REAR WHEEL hp! :wow:

When and where do I show up for a ride!?

Are you saying to add a Weldon inline pump to the system? At this point I do not see us taking apart the Rick's tank and switching out a perfectly good 044 pump.

That's what a Jody Bernard-built monster puts out... on 91 octane. :)

I would love to make a trip to Vegas in this car sometime. :unibrow:

Well you've got a place to stay and a garage to park the car in any time you want it.

you'll know if the pump is an issue as the fuel pressure will drop during a wot run (assuming injector duty cycle is good). Injector duty cycle will tell you if the injector is too small if the duty cycle starts approaching 85-90%+. The injectors in that motor (75's I believe) with an A1000 Aeromotive pump were perfectly safe. You may need another or additional pump at the 700 rwhp level, but I thought you had dropped the boost back with the larger blower pulley............ :yes:

Jody

Thanks Curtis. I hope to take you up on that offer someday my friend. :thumbsup:

Yep it has the RC 75#ers... and I never thought to check the capacity of this 044 pump til lately. Guess it's simple to add a 2nd inline pump if necessary.

Jason had told me he wanted to start me out at larger pulley/lower boost, but we will be losing some boost with the addition of the IC anyway all other things being equal. He wants me to get used to the car first at lower boost, which I can appreciate. I dunno, I will see if I can talk him into the smaller pulley. At least we can test how far we can push this system on a single pump I guess....

just keep an eye on the a/f, duty cycle, and fuel pressure.

Jody

will do!

If you're not afraid of more boost, neither am I. Let's get it dialed in, maybe pre-dyno with a couple test runs and some shakedown miles. The beauty of an injected car is, as Jody states, that we can study fuel trims & duty cycle to know if we're dangerous & lean before it's too late.

No motor likes to lean out. Lean burn is one of the worst things that any motor, especially a heavily Supercharged motor, can suffer from. Once we do our preliminary fire-up, we can gather some readings and map out a plan. At this point, we can rely on the 02 sensor and a tailpipe sniffer on test runs up & down the sweet stretch in front of the shop to get a feel.

If anyone has any thoughts, suggestions or objections feel free to chime in. Theory is all good, but experience is definitely not to be ignored. :lateral: