Fuel Pressure Gauge?

[DeathBeast]

I was looking into getting a FPR, but most don't come with a gauge.
*I really don't want to spen $300.00 on the Buschar kit if I don't have to.
*I also know you can buy the Aeromotive, and a bunch of fittings and such, but I was looking for a more easy/inexpensive bolt on.

*So far I've been looking at the Charged air unit. Charged Air FPR
-What is everything I'd need for this? (Parts/Prices/Links)

Thanx,
DeathBeast

 

[98TsiAWD]

Dont get that one, get the bolt on unit from www.fullthrottlespeed.com. I has a port for a fuel pressure guage on it (comes with a plug if you dont use one). $144.99

 

[jdmawd]

A fuel pressure gauge is something that should be monitored from the driving position in relationship to boost. Boost oil pressure and fuel pressure are 3 gauges you should have in your car at all times. I have the CAS reg and it works awesome. it arrived 2 days from the time of purchase.

 

[jake98gst]

I've never heard anyone argue that...I'm not disagreeing, I just wanna know...Why?

Anyone using a mechanical fuel pressure guage? Electronics ones are just too damn expensive.

Thanks,
Jake

 

[RipperXX]

^^^ What I was thinking.. The only serious downside is in a crash it is posible the line or guage could be damaged and spray you and the rest of the inside of your car with gasoline.... <--NOT GOOD

 

[dsmturboawd]

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i just threw mine outside. got the gauge, line, pod, etc off a guy on the mustang forums for cheap. when i got it, i just couldnt justify putting it under the hood. like said above, its just one of those gauges i want to look at for peace of mind.

 

[GTM]

Originally posted by jake98gst
I've never heard anyone argue that...I'm not disagreeing, I just wanna know...Why?

Anyone using a mechanical fuel pressure guage? Electronics ones are just too damn expensive.
Jake

Hi Jake, not sure I understand which proposal you are questioning.

The issue I would have with a mechanical gauge is how is it plumbed. Using anealed copper tubing is the safest, anything else is very risky. You would have to buy a flairing tool for connections.

Alternately you can fabricate something using an oil sending unit and a electronic oil pressure gauge. If you look inside the threaded fitting on _some_ (Toyota, VW etc. ) sending units you will see a slot for a screwdriver... yup that's for adjusting the sending unit so you can match readings if you are up to fiddling. It's important info to know once in a while but not to spend $300. Sure if you are having a problem and it means the difference of some race result it may be meaningful where everything is stressed to the limit. Certainly a total waste if you are at a drag strip for you don't have time to be looking at anything on the dash with the staging lights sequencing.

I've never heard of anyone installing one on the turbo pressure feed. Sure anything can fail including a gauge but unless you are trying for some sort of record for how many bits of information you want to process and record. Don't get me wrong for in my youth I've been there too including measuring what my shocks were doing. Since cash flow was always a problem plus the availability of mass produced items I was forced to make what I wanted.

That's my opinion, it's not meant to be insulting, just realize that the novelty may wear off in a week and someone else has your money.

Again, if you want to play with a FPR, go buy one from a wrecking yard off an old VW, install a "T" and run a gauge off that. You may find you need to install an additional fuel filter which has some air trapped inside to reduce meter flutter.

Cheers,
GTM

 

[jdmawd]

Originally posted by RipperXX
^^^ What I was thinking.. The only serious downside is in a crash it is posible the line or guage could be damaged and spray you and the rest of the inside of your car with gasoline.... <--NOT GOOD

If you think about why you would want to monitor fuel pressure in a turbo car that runs high boost levels. Im sure you will come up with an answer. No on suggested using a mechanical gauge in the car. Please don't make assumptions. fuel delivery and pressure is very important. I choose to monitor mine in reference to boost.

 

[99gst_racer]

I got an AEM universal fpr and it works very well. I also got the B&M gauge mounted to the side of it. It looks very nice. I cant remember how much the AEM unit costed (under $200 I think) and the gauge only costed like $40 or $50.

 

[jake98gst]

Originally posted by jdmawd
If you think about why you would want to monitor fuel pressure in a turbo car that runs high boost levels. Im sure you will come up with an answer. No on suggested using a mechanical gauge in the car. Please don't make assumptions. fuel delivery and pressure is very important. I choose to monitor mine in reference to boost.

But why? Forgive me for being a noob if that's what i am. The impression I get is that most people set FP at their AFPR by the guage in the engine bay and then don't worry about it when driving. Why should FP be monitered at all times? Why should FP be monitered in reference to boost? What problem will this help to diagnose when driving? When driving, could there be something that goes wrong that only the FP guage will warn you of?

Thanks for your help,
Jake

 

[Pointer]

The reason you would want to monitor fuel pressure in reference to boost is to make certain that you are maintaining fuel pressure under said boost. I had a problem with my turbo IS300 when we first put it together and were tuning it on the dyno. As soon as the car would come into boost it would go silly lean and I'd have to get out of it right away. We tried adding fuel to the point that the extra injectors were at 100% duty cycle and still had the same problem. Finally we put a fuel pressure gauge on it and found out that under boost the fuel presure was dropping off to something like 10 psi. Turned out that when I put the pump in I put the sock on backwards and the return from the other side of the gas tank, it had a saddle style tank and used the pump to transfer gas from the side without the pump to the side with it, was dumping on the sock and making air bubbles causing cavitation of the pump and reduced pressure. The car made no noises and seemed to run smooth coming into boost and had it not been for the wideband telling me that the A/F ratio was in the 17's I wouldn't have known and the motor would have popped. Had I had the gauge in the car in the first place, it would have saved us the headache of hunting down the problem.