Hello all, new here and new 2002 c5z owner. I've been combing through the car since I got it and finally ended up taking it to a tuner to see if she's healthy. The car is a&a blower, heads/cam, methanol on pump gas. I have a dyno sheet for 670whp from the old owner back in 2018. My tuner said the car loses fuel pressure up top and is totally methanol reliant for fuel which is horrible and what I feared. I pulled the rear wheel off and see its a oem pump with a kenne bell boost a pump. My question is a&a makes a single external pump kit that looks very easy to install. If i go with this option do i leave my boost a pump hooked up to the stock pump or just take it off? I'm not chasing power here and a nice "reliable" 650 wheel would be fine with me. Any input helps here!!!! Thanks!

 

I just underwent this entire scenario on my car which has similar mods (no meth though), and decided that I did not want to risk my car to a Hobbs switch and an aux pump.

I just completed the install of a Chris1313 fuel system with the -8AN feed and -6AN return.

It was quite a bit more spendy ($1700) but now I have one dedicated fuel system that is considerably oversized for my application.

 

Most of the time, if guys add the external fuel system they will remove the BAP. In a few cases I've seen the BAP moved over to the external fuel pump if they still needed to stretch a little more from the fuel pump.

 

Thanks for the response brother! I’ve seen these kits and determined to go the external route as $1700 is quite pricey compared to $1050 for the a&a external kit. I’ve heard great things about chis1313’s pumps though.

 

Thanks for the response! I actually just emailed a&a asking this exact question lol. Guess I’ll just remove the BAP as I’m only trying to hit mid 650s. Not chasing power here!

 

Totally! It was quite pricey, but honestly a hell of a lot easier of an undertaking than I expected. I have access to a lift, and I was able to knock out the install in 2 days.

The ability to fine tune fuel pressure using an Allen key is also really nice. Either way, A&A makes fantastic products and I have no doubt that you'll be incredibly happy with their secondary pump kit.

 

I bet installation was a breeze! I hope I don’t regret my decision!

 

I wouldn’t say a breeze, but it was well within my level of mechanical experience. Mounting the regulator was a challenge as the engine bay is incredibly space constrained, but I got it to work.

I had a bad vacuum tee that I didn’t realize because I didn’t know enough about vacuum/boost referenced regulators to immediately catch it and after 2 hours of tuning, we weren’t getting proper fuel and I thought I really messed up.

I also had to fix a wire that my boost-a-pump was spliced into as I removed that with the install, caused a no start condition until I traced it.

My real only complaint with the Chris1313 install instructions was that he didn’t have a “common problems and how to solve them” section and for someone who has zero fuel system experience, it would have been helpful.

Luckily he’s fairly responsive over his social medias.

 

So, with the a&a external kit I see I'm going to have to t into the master cylinders vacuum line as well for the switch. Since my car has a boost a pump already installed I assume there is a T already in the line for my blow off valve and the boost a pump. Wondering if ill just do away with the boost a pump and use that t into the vacuum line.

Excited to get this kit, and I assume I may have some of the same issues that you did because ill probably remove my boost a pump too. I appreciate the inciteful information and if I have a similar issue I may reach out to you!

 

The boost a pump simply increases the voltage at the original pump when the motor sees boost. I don't see a problem with leaving it in, your tuner would be able to account for it. That being said, it is likely an unnecessary thing to have if you're going with an Aux System. I think most would leave it in, but it's potentially another fail point.

You can absolutely use that Tee, or Tee off of that to install the Aux System while retaining the boost a pump.

As a side note, I would buy metal tees, or make sure that you're getting very high quality automotive grade plastic tees. A melted tee that stops your hobbs switch from seeing boost would potentially be catastrophic. Happy to help and offer insight! If you PM me, I'll give you my number and I can send you pics of my install of the Chris system.

 

Update to anyone who finds this thread. The A&A single external fuel pump kit installation was a breeze. Car make 665WHP on 93 and my tuner said it looks like A&A has greatly improved the quality of their kit since the last time he's seen the A&A single external pump kit.

 

There's nothing that was impovered its the exact same kit except for the hobb switch. i bought their kit when they first made it public.IIRC 2010 The original hobb switched turn on at 6psi. I've Changed my hobb into an adjustable one that turns on at 1psi.. Im over a 1000hp with this kit but i have meth also.

 

Just going off what my tuner said. I'm not sure the differences between the kits 10 years ago and now, but he's been in business a LONG time... I can tell you one thing the kit is quite a bit different then the instructional PDF A&A has online though.

 

Yeah i did not follow the install direction. I made it way easler installing my way.

 

Then how do you know the kit quality isn’t a little better than 10 years ago lol…? Just trying to point people in the right direction that might want to go this same route I did.

 

I give up, I said their fuel system is the same except for the hobb switch, Obvious its a superior system because i still have their original. So, if it's better and they upgraded thats great. Even if its not, im living proof that even the old shitty system is still kicking with the original pump and regulator. So there, you win. I'm promoting how good their system is so, if it's better great. If you want to get to the nitty gritty of which system is better then so be it. I still have their original system so that says it all. Whenever it was for sale.
And finally, come back on here 15yrs from now and give us an update on how the new system is still working or not (you probably wont even have the car to give us an update) Im to old so,i won't be around, but i bet my fuel system will still be kicking after im long gone.
P.S. Just remembered i had a leak so i had to change the hose from the fuel rail to the fuel regulator a few yrs back, So let me rephrase that. Come back 13yrs from know and let the forum know that your new system did not leak and brag how i was wrong and good riddance. SO, until you give us an update you cant say its better than the original until you prove me wrong.
At Least we gave the forum some entertainment on who's system is better, but all and all A&A is getting free AA++ rating from this discussion. And that's what your goal was so, you win again, congratulation.
Plus i was bored, so thanks for responding to my post.. If you want to keep going let me know. Im retired so, i have nothing but time, will maybe not that much time. So don't wait to long to respond.

Here's some picks. Im sure your going to keep your's nice and shinny and in a controlled environment, My car is daily, If the roads are clear, my driving, Chicago area is not for the faint of heart to drive their c5's all yr round like me
So tit's been through every condition possible and will continue to as long as i'm still around. So you got a lot of catching up to do. GL with your new and updated system.
I'm having fun, thanks for this. Took up some of my boredom.



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