TT_Rex_7

And the chances of that happening are...?! Have you ever seen someone in a race car knock the switch off!? Better yet, have you seen one knock the switch off, AND blow the motor?! At any rate, I still highly doubt it'd blow the motor. It'd continue to run off the fuel in the lines until the pressure ran out, and then it'd stall. There's been plenty of people that have had the fuel shut off for various diffrent reasons during a WOT run (drag strip) and the motor still stayed intact without an issue.

Again, I would STILL use a relay, but a switch can be used. But to make it better, i'll state to place the switch in a location so it can't be pushed off during a WOT run!

-Alex

TT_Rex_7

I wanted to post this by editing my last post, but it wouldn't allow me...

It's funny how two people have commented on the negative effects of running a switch in a thread about running TWO fuel pumps. The chances of knocking a switch off (as long as the switch is placed away from reach while driving) is less than one of the two fuel pumps failing. If one of the two pumps was to fail, you wouldn't even know it. Which, by the way, WOULD cause you to detonate as soon as you went on a WOT run with only one pump working!

Personally, I'd rather take my chances with a switch, rather than two fuel pumps.

-Alex

RxSeven1

iTrader: (2)

right now have a fuse in line with my fuel pump that is located near the daah. if i go somewhere and i dont feel safe leaving my car there, im simply pull the fuse and stick it in my pocket. this way if someone were to try and jack my car it wouldnt start. i just figured a locking switch would be alot easier...

HDP

iTrader: (2)

If I was a gambling man, I would bet the bank no race car shuts off the switch while at WOT. They would get off the throttle FIRST before switching off. I'm speaking of running at WOT and accidentally switching off and not realizing it's off...

TT_Rex_7

I know what you was speaking of. I was saying the same thing, I guess I just didn't explain myself good enough. The point was there's a VERY slim chance of a race car driver accidently knocking the switch off, as well as a street car. However, as I've already stated, you need to place the switch out of reach while driving. If you was to mount it under the steering wheel/dash, then the chance would be very high of your knee knocking it off...In that case, someone would be stupid to use a switch!

-Alex

HDP

iTrader: (2)

I understand what your saying but there's not many places to mount it that would be out of reach and then it would be pretty much useless as an on/off switch because it would be an inconvenience to use.

mad_7tist

why run a switch when the car already turns on voltage for you?? just use it to power a relay

TT_Rex_7

Not to presure an argument or anything of the sort, as this is way off topic from the thread, but theres plenty of locations. If your only using a single din cd player, you can mount it in the second din. There's the little change pocket in the center counsel as well. You could also even mount it up UNDERNEATH the dash.

Regardless of where it's mounted, I would personally see it as an inconvenience, along with you from what I gather. However, it's just personal preference. If the guy wants to use a switch, and does it properly, there's nothing wrong with it.

-Alex

HDP

iTrader: (2)

Yeah, I have to agree.

cloead

I wasn't trying to be a dick or anything, but I don't see the reason for a switch (the stock wiring will switch the pumps on and off for you), and if youre talking about tucking a switch up under your dash or something along those lines, how long would it take till you got absolutly sick of fumbling for a switch every time you got in and out of the car, or if you completely forgot at all. I know my stupid mini battery would die in about 15 minutes if I left my fuel pumps on.

Also, if I ever get off my *** and install an electronic fuel pressure gauge, I would then know if one of my pumps failed. Plus I have a wideband so I could tell if I started to lean out or something.


oh.. and p.s. If you had the switch mounted anywhere somewhat conveiniant.. and you get passangers like I do, that mess with EVERYTHING in reach, I could imagine the switch being accidentaly flipped off. I have a dummy switch in my center console (used to be for the fan mod in my old car) and people ALWAYS flip it on and off for no apparent reason, and when I had my power fc commander sitting in a gotham holder, some people would actually start pressing buttons and stuff on it when I would run into a store or something like that. I was like WTF?!

TT_Rex_7

If you think I was implying that your a dick, I wasn't.

At any rate, like I've already stated, it's personal preference. HDP, yourself, and I might find it inconvenient, but others might not. If he want's to hook a switch up, let him. There's nothing wrong with doing so.

Actually, you still won't know with a fuel pressure gauge. You won't drop fuel pressure at all. You could have a 100 pumps, and the pressure in the lines will always be what you have your FPR set to. (Which will rise 1:1 as your boost rises) You just won't be flowing enough fuel for a WOT run if one of your pumps fail. This is why alot of people are against running dual pumps.

As far as a wideband goes...Do you really think you can catch it and react fast enough to prevent the motor from blowing?

Although this is/can be annoying, the worst that can happen is the car stalling. Besides, it'll probably freak them out so bad, they won't even THINK about touching another switch/button in your car!

-Alex

cloead

When I was only running one walbro I would start to drop fuel pressure near redline at high boost, so if one pump failed, I could see the pressure drop and be like AHHH!

mad_7tist

Actually, you still won't know with a fuel pressure gauge. You won't drop fuel pressure at all. You could have a 100 pumps, and the pressure in the lines will always be what you have your FPR set to. (Which will rise 1:1 as your boost rises) You just won't be flowing enough fuel for a WOT run if one of your pumps fail. This is why alot of people are against running dual pumps.



this makes no sense

the fpr restricts flow back to the tank creating the line pressure. pumps supply volume. restricts create pressure. you lose FP when the pump cannot sustain voulme due to the amount of fuel the injectors are flowing

TT_Rex_7

Your a 100% correct!

Either way, the point I was trying to bring across was that you typically won't know when one pump has failed. In cloead's case, his FP drops off, so there's a chance that he'll catch it.

-Alex