George84

Its been a long time since I really messed around on my vert but I have started to tear into it again and my fuel pump went out today when I had it in my shop (I got lucky there). Now dont all s5 have a fuel pump resistor which means I can upgrade my pump now instead of later with a FD fuel pump? I just wanted to make sure it would be a seamless swap. Where are the best deals on a new fuel pump at? My local parts store was $193.11 on an FD pump with my shop discount.

Thanks

arghx

iTrader: (3)

swap in another nonturbo pump, or possibly a T2 pump if you have a lot of mods. any bigger than that and you will just increase your fuel pressure and get bad gas mileage. the resistor relay doesn't eliminate that.

IFc3s2nVI

iTrader: (3)

just get na replacement

WadeMCarter

check the for sale section around here and wait until someone in the 3rd gen section upgrades their fuel system and sell their stock fuel pump. Until you can find a cheap, more powerful replacement, just use another TII fuel pump. Unless the cost of the TII pump plus the cost of the FD one off the forum is more than the cost of the FD one right now...

https://www.rx7club.com/showthread.p...ight=fuel+pump

or this FD one in teh for sale section for 30 dollars shipped...

marK's

what's the flow on an FD pump?

George84

yea I actually bought a used FD one before and it was junk, it was not putting out enough pressure to run the car. The reason I dont want a n/a pump is because I am wanting to run nitrous in the future. I priced a t2 pump and it was the same price as the fd pump; are they the same pump? Where do you guys think I might find the best deal online for a new pump?

rotawhat

iTrader: (1)

walbro 255 $100 at your door

http://cgi.ebay.com/ebaymotors/WALBR...spagenameZWDVW

phoenix7

If it's still NA then replace it with another NA one. Unless you want to waste money before you waste more money on nitrous.

Rotaryhaven

iTrader: (17)

From what I understand you are supposed to run another pump with nitrous in conjunction with your normal pump. I have a 1991 vert pump I can get it to your door for $30 shipped.

George84

what? if I buy a stock one now I will have to replace it later with an different one, it will still run just fine with an fd pump or an aftermarket pump, I might as well put the one I want in it now

phoenix7

run two of them or buy an external one to go along with the NA one. If you upgrade now you'll get crapy MPG.

hurleysurf24

iTrader: (3)

get a 255lh warlboro ... its only 150 bucks or so with the kit. Also its pretty much a direct swap in the verts ... very easy

NZConvertible

Sure, as long as you don't mind increased fuel consumption and reduced power as a result of the richer mixtures. Given how cheap a replacement NA pump would be, your logic isn't actually that logical.

Using a Walbro pump on an NA engine would be stupid...

hurleysurf24

iTrader: (3)

not thinking outside the box is stupid

running any type of fuel control; i.e. fpr, ems, or different injectors would work well, while at the same time providing for an added level of efficiency.

George84

Dont s5 fuel pumps have a resistor to stop the richer mixtures? I am running a S-AFC II that I could use to get the correct fuel ratio.

phoenix7

increase the amount of flow + increase the amount of pressure (by limiting inj. flow) = ??

I'm telling you man, It doesn't sound like a good idea to me.

George84

Well what is the point of the resistor then?

NZConvertible

Fuel control isn't thinking outside the box; it would be the correct way to compensate for changes to the injectors and/or pump. But having it tuned would also add a lot of cost to what is basically a very simple repair job.

If a big pump and some form of fuel control are in the near-future plans then it would make some sense to do both, but the tuning required to make it work properly would be far more expensive than a used NA pump (which could be resold when an upgrade is actually required).

Note that a Walbro is still going to be massive overkill for an NA even with nitrous...

The resistor has nothing to do with controlling mixtures. It reduces the pump speed at low load to increase the pump's lifespan. The factory fuel maps will be tuned to to suit.

What are you going to do for tuning? DIY? Professional?

George84

Well the plan was just to put the new pump in to get it out of my shop and back into winter storage until I got the nitrous kit on in early spring and take the car back to the tuner. I have put maybe put 3000mi on the car in the last 2 years, it is just one of my toys that I am now going to finish the project I started. When I had the pump go out on me I was just planning on putting a fd pump replacement in on scathcart's recommendation for my nitrous setup.

NZConvertible

It should run fine with a mild upgrade pump like a TII or FD, using a bit more fuel and making a bit less power, which doesn't sound like it'll matter in this case. I can't say the same for a huge pump like the Walbro...

George84

Well I put the pump in and it started right up, I can't even tell if it is running richer by the smell (no cats) or tell if there is any performance loss/gain, if feels the same as the stock na pump. Just letting you guys know how it turned out