Help me pick a fuel pump
#1
Help me pick a fuel pump
Just started logging and street tuning with the S366. I'm going to get my tune as close as I can at 17PSI before adding water to tune for 20PSI.
I have started to encounter what I suspect is fuel pressure drop. This only occurs after I the car has been running a while and it is intermittent. It scares the **** of me. Car will go lean at some point (sometimes under boost!). It is difficult to replicate. Sometimes it is low RPM, sometimes it is hammering it.
SO - I want to eliminate a sketchy fuel pump from the equation. I want to remove the Walbro 255 I have had in the car for 5 years and add something good for the S366. Say 500 ish hp.
WHAT is a good, relatively inexpensive pump to get me there with minimal fabrication in the tank? I only want one pump. Yes, I have rewired the pump to run at full voltage all the time.
I am leaning towards the Aeromotive 340 or Walbro 400lph.
I have started to encounter what I suspect is fuel pressure drop. This only occurs after I the car has been running a while and it is intermittent. It scares the **** of me. Car will go lean at some point (sometimes under boost!). It is difficult to replicate. Sometimes it is low RPM, sometimes it is hammering it.
SO - I want to eliminate a sketchy fuel pump from the equation. I want to remove the Walbro 255 I have had in the car for 5 years and add something good for the S366. Say 500 ish hp.
WHAT is a good, relatively inexpensive pump to get me there with minimal fabrication in the tank? I only want one pump. Yes, I have rewired the pump to run at full voltage all the time.
I am leaning towards the Aeromotive 340 or Walbro 400lph.
#5
Eats, Sleeps, Dreams Rotary
iTrader: (52)
I highly recommend logging fuel pressure.
I have run an Aeromotive Stealth to 454whp with zero signs of drop. I have seen it actively support 530whp with no issues, though that is definitely its relative limit.
I plan to run dual Stealths with integrated check valves. One dies, the other will keep trucking. I have always avoided dual pump setups. For the same reason as others, if one dies the single pump will allow the car to go lean. But dual pumps that can support the power individually creates the appropriate redundancy. This is why I used check valves. If one were to die, it wouldn't bleed pressure from the other.
I have run an Aeromotive Stealth to 454whp with zero signs of drop. I have seen it actively support 530whp with no issues, though that is definitely its relative limit.
I plan to run dual Stealths with integrated check valves. One dies, the other will keep trucking. I have always avoided dual pump setups. For the same reason as others, if one dies the single pump will allow the car to go lean. But dual pumps that can support the power individually creates the appropriate redundancy. This is why I used check valves. If one were to die, it wouldn't bleed pressure from the other.
Trending Topics
#9
Big Bird's Here!!!
iTrader: (26)
Im still in the process of my build and I'm going with the dual walbro 255. Ive always heard they are not the best in terms of reliability but at $100 a pump its cheap. And if you're running an after market ecu, I'm going with an AEM ems, you can wire in a pressure sensor by the fuel rails and run it to the ecu as a failsafe. I.E. if pressure drops the ecu will pull timing.
#11
^^^ What that guy said.
I also learned something new today - and that is that there is such a thing as submersible fuel hose.
I always thought that if gas and oil (I premix) are in the hose, it should be able to have gas and oil on the hose (when its in the tank).
It will be like a science experiment when I change the pump out - I want to see if my off the shelf fuel injection hose has deteriorated from being submerged in fuel.
I also learned something new today - and that is that there is such a thing as submersible fuel hose.
I always thought that if gas and oil (I premix) are in the hose, it should be able to have gas and oil on the hose (when its in the tank).
It will be like a science experiment when I change the pump out - I want to see if my off the shelf fuel injection hose has deteriorated from being submerged in fuel.
#12
Eats, Sleeps, Dreams Rotary
iTrader: (52)
It will deteriorate and break. Buy Gates submersible hose. A little pricey, but it will get the job done. I am looking forward to the day when manufacturers move to AN fittings off the pump so we can start running internal hard lines. Ditch this submerged rubber business.
http://www.jegs.com/p/Gates/Gates-Fu...34981/10002/-1
http://www.jegs.com/p/Gates/Gates-Fu...34981/10002/-1
Thread
Thread Starter
Forum
Replies
Last Post
trickster
2nd Generation Specific (1986-1992)
25
07-01-23 04:40 PM