Ahh read it wrong since it was in the same sentence. Either way if the topic starter can get access to do what I did it will give him a sure answer if it is the pumps or not. It's a real pain in the butt physically change the setup out for a simple test but in my case I had already changed FPR and checked all lines wiring etc... I am pretty positive its a pump for him due to the e85 usage and the sure volume of fuel needed with a t67 sided turbo and 1600cc injectors. One pump wont cut the 26lbs of boost in my opinion.

 

Def not with E85 and 26psi

I too know what a pain it is to have to do that but just like in medicine you must rule things out one by one before you can come up with a diagnosis

 

I bet you your line from the FPR is not attached, its happened to me before, sometimes the simple things is the issue.

 

This exact same issue happened to me, the FPR line came off and I added in tons of fuel and nothing changed.....once the FPR line was fixed everything returned to normal.....doh!

I bet this is his problem as well....

~Zach

 

I swapped the primary wiring to the other pump and both seemed to perform the same.

I do have a tiny leak from the Earls inline filter. It is the filter itself that is leaking not the an connections. I know that the hobbs switch is performing well. The red light I installed in my car comes on areound 8 psi every time. The vacuum hose connections are perfect. I am so ready to hit 30+ psi, I just keep having these set backs.

I don't really have anyone that isn't using their fuel pumps. It might be worth just buying two brand new ones. The only thing is if that doesn't fix it I'm blowing money. This is all part of it I guess.

It's on there. Thank though.

 

I would just go ahead and replace the two exisiting pumps with two brand new pumps. I realize that it is an additional expense, but you will have eliminated the pumps as possible culprits.

You should invest in a fuel pressure gauge. You really need to know FP at WOT, IMO. AFR's are a good tuning tool but I prefer a fuel pressure gauge for keeping tabs on your pumps' delivery at WOT. Used in conjunction with the AFR gauge you will have a more complete idea of what is going on.

The only way to know whether each pump is delivering to capacity is to wire each one up and have it pump fuel into a bucket for a minute to the tune of 4.25 Liters/minute.

Hobbe`s switches are inexpensive, so you can just go ahead and replace the existing one with a new one.

 

I think I may have stumbled on to something. . . Regarding the light that I have wired to show me when the second fuel pump is coming on. Get this. . . I used the same power wire and the same ground to the second pump for this light. So, when the Hobbs switch kicks on and completes the circuit that powers the fuel pump, the light comes on and actually connects the signal between the power and ground to the battery. This would be just like taking a wire and splicing it into the fuel pump power and ground and trying to run the pump. I'm not sure what this has been doing. Does anyone know what this would do? I have probably burned up the pump or damaged it somehow. I am wondering if this has been the problem all along. I won't know until I change out that pump.

 

Well, I was right. Without the light hooked up I hit 29 psi and a/f 's are 10.0 very rich. The tires broke loose in second when the boost hit. It feels amazing. Thanks for everyone's help. I'm looking for around 38 psi tomorrow. I can't imagine another 100 hp or so.

 

2theMAX, You, Rob and I should get together and start our own local group. I imagine we could get Mac214 to show up too. Just friendly get together, nothing serious. Congrats on finding the issue.

 

Tom,

Rob and I have talked about this before. You guys are heavy into the drag scene while we're more in the street scene. It'd be cool to get together though. Whenever you're up to it!
Justin