check the Pumps ground connection.
Maybe you draw the ground by the hoses ( if the are stainless steel covered ones )
Fullblown units CAN have that problem due to bad grounds.

In no way the pump heating the hoses fast due to pumping fuel. ( assume that you have ambient temp fuel in the gas tank)

 

Your problem is you have them both running all the time. You need to rig the second pump to either a hobbs switch and relay to flip on at around 12-14psi or if you have an AEM just hook it up to an AEM low side switch to a relay and program it in the AEM to turn on at 12-14psi.

You will also need a second relay inline with the first that switches on with ignition.

 

Do you have a diagram or any more info to do the connection? i have an AEM EMS, but i have seen a lot of people run a setup like mine..

 

After thinking about it for awhile I believe I have a simpler solution than the one I used. This will work if the ecu does not output 5 volts from the lower side output when it isn't receiving ignition, which I believe to be the case. So when the car is off both sides of the relay should be 0v and when the car receives ignition both sides of the relay should be 5v until the low side switch is activated and becomes 0v, causing the relay to switch on.

The only thing I am worried about is how this will behave when the car is off.

The easiest way to test this design is to just get a multimeter and read the voltage from the LS output you wish to use on your AEM to your red ECU ignition wire when the car is off and switched on. If you get 0V whether the car is off or on, you should be good to go. Make sure you AEM low side output is programmed in the software to be off under idle conditions (set At Least 14psi). You can also manually switch that output on via the AEM software (set to At Least -15psi) and ensure you see 5v when doing so.

Under AEM pro goto Options -> configure outputs and pick an unused low side switch (I used LS11 which was the AC because I removed mine). Then you can set whatever conditions you want to activate that switch for. I am using At Least 14 psi and At Least 64% throttle position to activate my second pump. Only Basic Activation is checked as active and all other conditions are set to 0.

Along with the 30 Amp fuse, ensure the relay can take the amperage as well. Of course you ground your second fuel pump to the chassis. I believe I just grounded it on one of the back seat belt bolts. My primary pump just runs on stock wiring.

 

Thanks for your help, but i'm a little confuse, so what will be the LS for me if i have A/c and everything else? so if i have Aem ECU I'dont need to get any hobbs switch or solenoid switch to kick at 15psi?

 

That is correct. The ECU can control when your second pump kicks on by just boost or a combination of boost and any other inputs (throttle position is useful). I did mine by boost and throttle position.

If you have A/C, I think there are still outputs that are unused, but I will need to look it up.

 

Attached is a picture of what to do in the AEM software, you make sure to check the active check box and then you can set any of those parameters. I suggest leaving everything 0 except TPS and Load. I use 65% TPS and 14psi Load. I am going to actually try to reduce the 14 to a lower number like 5 to see if it helps with my pressure surge. If that doesn't work I am going to try and raise it a bit and see if that works.

 

would a single walbro255 and 1000cc injectors be good enough for a evo 9 stock turbo and stock cams on E85?
i have all the bolt ons you can possibly get for the car.

 

Yes, but if you ever plan to upgrade I would go with 1450cc bluemax injectors as they seem to be the largest ones you can get and still tune decently.

 

its a stock ecu dont you think 1450cc would be a b*tch to tune drivability, idling, DD etc
i've heard of a brand called PTE. are they any good and will they perform well on e85?
thank you

 

Yea those are decent injectors, but the bluemax are the best. I bet you can still tune 1450cc injectors on the stock ecu if you know what you are doing. You would have to ask somebody that has ECUFlash experience though, I use AEM.

 

Not needed for your current goals.

 

what exactly isnt needed for my current goal david? TIA

 

1440cc injectors are not needed is what he was saying, which I know, but goals tend to change and nobody wants to buy injectors more than once. I will have to buy my 4th set once I upgrade to a 3586 because of my crappy judgement. Just trying to help you avoid the same mistakes I already made. The only way I would suggest smaller ones is if you can guarantee you will be happy with the goals you layed out and never want to upgrade.

Either that or if they are a mother to get running on ECUFlash, then you might want to stick with smaller ones too obviously.

edit - nm, he was talking about the pump. Not sure the limit of a single on E85. I know my 1150cc injectors won't support my current power with a single pump.

 

I read just the first post in the thread. E85, 1450 cc injectors, Green etc. and the question was about do you need a double pumper or so I thought......you do not need a double.