The setup I'm running is a JWT TT 700bb kit w/ built block. My fuel setup is a warlbro 255lph to an Aeromotive A1000 and FPR with RC 1000cc injectors.

My tuner called me today and said that it seems like it's running out of fuel up top. Any reason this could be happening? I figured that my setup would flow more than enough for this.

 

Its possible. You may need a twin pump setup for that but really need to know more about how much boost you are running and power goal.

 

I figured that the 700bb's were pretty much maxed out at 600rwhp. I was always under the impression that the A1000 flowed enough to make 600+. Perhaps I'm wrong? Is it possible theres a bottleneck somewhere? Perhaps a dirty filter?

 

The walbro can only really support up to 500hp. I have never heard of using a A1000 with it. From my knowledge if the walbro can only support up to 255lph then that is your bottleneck because the A1000 can only pump as much as the walbro supplies. Maybe someone will correct me if im wrong.

 

I have never heard of using two fuel pumps in series.

 

A lot of people have had success using the a1000 in big power setups on other platforms. I should state that I'm not the original builder of this car but I would imagine it would be capable of supporting what these turbos can offer. Or so I thought.

 

The 255lph should pump more than typical 255s because it will not be under pressure. A 255lph pump in a typical G will be pumping against about 55psi but feeding the aero motive pump it should be only a few psi. Typically you see a swirl/surge tank before the bigger inline pump to aid in the smaller pump keeping up. So the tank would be a liter or two and would be full at all times while cruising and under WOT it might drain down a bit, it just allowes a little more time for the smaller pump to keep up. Usually WOT runs are less than a few seconds or drag cars 13sec or less.

I will try to find pictures of a few. ***edit found these***

the AAM set up, surge tanks have pretty much died out since CJM introduced the twin pump hanger and i think Sound Performance has a tripple pump hanger for E85 guys. It seems to be more common now than an external pump set up.








A couple other issues could be no fuel return? It would be odd if they did a custom fuel system and it didn't have a return. Also I wonder what the fuel pressure is? Turning it up a bit could help but that is more help if your injectors are too small....yours are not.




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I forgot to mention that it does in fact have a surge tank setup.

The strange part is that GTM tuned the car back in the day and had the opposite issue where the turbos were maxed out and everything else could have gone for more power.

 

I have done a little research for you, with out a surge tank the A1000 will only flow slightly more than the 255lph. But with a surge tank you will see the benefits of the smaller pump to the larger inline pump.

Here is how to properly configure it.





Here is another set up I found, i wouldnt want it in my trunk but it helps illustrate the idea








While searching I also found that people were having issues with the A1000 crapping out on them.


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Sorry i was typing my next post(that is now irrelevant) when you wrote this. Maybe a clogged filter

 

What has changed since GTM tuned it?

 

There was a custom dual 3" exhaust on there. I purchased a Motordyne TDX v2 3" exhaust to replace it. I don't think that would be an issue though.

 

I was thinking that you didnt have a surge tank. Do they have a good vacuum line hooked up to the FPR? Is it making more power right now then when GTM tuned it?

 

I would assume yes on the first question. As far the second, I don't know. I'm not really getting too much info back on anything so I'm swinging by the shop after work tomorrow. I hate talking more to someone behind a desk than talking to the actual tuner.

 

They're saying it might be the Walbro because they go bad from time to time. I know this is a possibility but is it likely? I hate throwing money at something just to trouble shoot it.

I myself observed in the past that the FPR gauge would just drop to 0 when you shut the motor off. Perhaps the check valve went bad on it?