What are you using to monitor Fuel Pressure?

Looking for a way to monitor fuel pressure inside the truck (ie- not the basic gauge on the fuel rail), and wondering what people are using for their 1st gen (2rz/3rz)?

I like the idea of Ultragauge, but I haven't seen a way to add a fuel pressure sensor to the factory ECU input/output on the 2rz. (Let me know if I'm wrong!)

I'd like to use a multi-gauge single unit set up, as opposed to a single fuel pressure gauge that would be a bit obscure on its own in the cab.

Any ideas?

 

I have not looked in a few years so by now someone might be selling what your looking for .

You would still need to add a electrical fuel pressure sending unit for what ever gauge you might find.Because there is nothing in the first generation trucks to monitor fuel pressure . Have you given thought as to where you would install a sending unit?

The fun old days of manual fuel pressure gauges in the cab could be very interesting.

I run all stand alone gauges it works for me.

 

I put a set of Prosport Evo gauges in my Nissan 240sx; the fuel pressure gauge by inline tap post-filter and pre- rail/FPR. The sensor is small, not the archaic enormous can style.
They look great in that car, but too much for this truck. (And now that prices have gone up so much, it doesn't make sense to spend $120 on a single gauge.)

Figured I'd tap the Tacoma in the same way, since the rail layouts are nearly identical.

Trying to keep it simple, sensible and affordable. Being able to just add a FP sensor to the factory sensor outputs, and all display thru one unit is what I'm really after.

 

Dont think they have a turnkey kit.....you'd just have to buy all the parts and fab your own...

$19 RUSSELL/EDEL 640700 Fuel Pressure Take Off Banjo Belt

Amazon.com: RUSSELL 640700 Fuel Pressure Take Off Banjo Belt : Automotive

 

You would need a fluid pressure sensor and gauge combo...
the rest of the pieces are easy to come by.

And you'd to have mechanical one to calibrate all that....
So.....

 

Are you worried about fuel pressure while driving? Or just curious?

Heck just pull up short and long term fuel trims and watch them.. of they're stable you're all good..

 

They dont sell those kits because the oem denso's last so long.

And then most national part stores stock em...or a day away...


Usually what kills em is an old rusty tank...... running low fuel in the tank all the time,
and then there is just plain old age...

Its pretty easy to test by pulling the return hose of the fuel press reg and shooting into a bucket...


You get 150K out the factory one......but after that I'd replace it 100K.....

its not a good ideal to leave a toyota truck sitting on the side of the road....these days...

 

I'm already using an OBD2 reader and Torque Pro to monitor every fuel channel available, but that still doesn't tell me enough. I'm concerned the slightly used Walboro fuel pump that I put in might be intermittently going out while driving long distances. I had a really strange fuel cut feeling that almost left me stranded the other night on a 150mi trip. Had over a 1/4 tank of fuel, and have since run it down past that, so it's not the dash gauge.

Was it the pump getting warm and slowing?
Was it voltage? (seems unlikely, given behavior)
Was it water in the gas that I got?
What was my pressure when this happened?

One thing that could help me determine the symptoms would be to watch the fuel pressure as the symptom is happening.

I'm already chasing a stuttering/bucking in the 1200-1600rpm range, that could be the culprit of the cracked exhaust manifold and oxygen sensors getting inaccurate readings.
(Cleaning the MAF did seem to smooth out some stuff. Also my start up and idle when cold isn't right, already cleaned IAC, might replace.)

On my 240sx I figured out I had a bad FPR as soon as I could see the readings on my gauge. But I don't want a stand alone gauge in this truck. I just want to add a FP gauge to the host of original sensors and all display on one unit.

Also, thanks O Silver Taco for the link on the banjo fitting. Didn't even think about these being a thing. Looks to be an easy tap solution that I'll end up using when I figure out the final method for monitoring.

 

Do report back if you come up with something...popular subject here...

Lots of people's ask about fuel pressure....

only know turnkey is an analogue one from LC engineering....its only for the 4-banners...

https://www.lceperformance.com/Fuel-Pressure-Gauge-Kit-2RZ-3RZ-p/2019121.htm



but way easier and safer to install thru the fuel press reg fitting....instead of busting into the other end of the fuel rail......those factory fuel hoses are couple hundred each to replace......gentle with those...crispy with age...

 

Honestly fuel trim is all you need to watch. If it’s in range the pressure is good, that’s all.

You can do a wideband gauge to watch if you’re really worried.

Only performance cars run true fuel gauges, it’s a fault point in the system that isn’t needed.

 

Not trying to argue but literally everything you mention would be reflected in a fuel trim reading

If you have a known crack in the exhaust upstream from a oxygen sensor I'd fix that a soon as possible

 

Turbosmart fuel pressure regulator with Aeromotive mechnical glycerin-filled gauge and Evil Energy fuel line with 6AN fittings.

I also have an Underdog Racing Development fuel rail adapter with extended bolts. If you want that solution for non-permanent measurements, I can sell it to you.

 

I think that was the block I found earlier. It's more than I need or want to spend. Likely just go with the banjo adapter.

I did notice how expensive those fuel lines are when looking up parts recently. Luckily they were still in good shape when I replaced the fuel filter last year.

I do understand it's a possible fault point, but the one I installed in my car hasn't been problematic whatsoever, and has helped diagnose 2 separate failures of other fuel system components (FPR and blown hose in tank).

A wideband is certainly nice to have for AFR, and might eventually install one, but it still doesn't tell me what pressure my fuel system is at. That's the single thing I'm chasing right now.

"Do I need a pump or FPR?", "Am I over/under pressure?" AFR still won't diagnose that part, but only tell me rich (maybe FPR, maybe O2, maybe ignition?) Or lean (maybe pump?).

I'm not interested in arguing, but I'm all game for input and learning. And the reason I'm here lol.

I've been staring at fuel trim mapping and numbers while driving, and while it's informative -it's still not a simple pressure reading. Maybe your experience can delineate a pressure reading given the STFT and LTFT, but I'm not there yet.
How would you determine pressure from fuel trim?
Will that help isolate whether it's an injector, FPR or pump? How so?

Literally ordering a cast manifold today and new sensors to be safe. Been holding out trying to find a decent deal on the revised OEM tubular steel mini-header, but nothing reasonably priced seems to be available. $250-410 "New" is absurd, and no junkyards seem to have any.

Thanks for the offer! I think I'll end up using the banjo adapter for the sensor port. And that setup sounds nice, but probably more than I want to spend and modify from stock.

I'm all for mods when it makes sense, but I'd like this truck to stay as simple and oem as possible.


I really do appreciate everyone's input, and hope I don't seem dismissive. All good points to reflect on, so Thank you!

 

Failing to see what is so sophisticated about a fuel rail adapter and mechanical gauge; that is what 99% of 2RZ/3RZ owners do; but OK.

 

They're overly expensive and don't achieve my goal. I think you're missing the point.

I don't want to change my FPR to aftermarket.
I don't want to get out of the truck on my 700mi road trip, and pop the hood to check a mechanical gauge. Not to mention it'd be impossible to see fuel pressure while under load.

I simply want to see fuel pressure while I'm driving. While the engine is under a load. Throughout the RPMs. Monitoring all the sensors at the same time, on a single device.. whether my phone or something like an Ultragauge. I suppose I'm the 1%

(Why under a load? Because the other night when my truck suddenly acted like it was fuel starved {⅜ tank}, it was only while I was in gear, under a load. Putting it it neutral- it'd rev up fine, but as soon as under a load it sputtered out. Which seems totally unrelated to a fuel pump or FPR, but having the pressure quantity instantly at a glance could help in that moment for diagnostic purposes. It's just one part of the whole equation. ...But that's why I want all the sensor readings on 1 screen, to instantly have the information if something is off.)

This truck is (unfortunately) about basic utility and being painfully frugal with expenses. It's been treated rough before my ownership and it's not a vehicle I want to upgrade, it's more of a work truck to get me thru. Hopefully the next Taco will be something deserving of the same attention I give my car, with sweet mods.

But I still want all the engine data, inside the cab, while I drive.

Sorry for the novel

 

I guess you could run a braided hose all the way into/under the dash.....fred flintson job

$10 MEASUREMAN 1-1/2" Dial Size, Glycerin Filled Fuel Pressure Gauge, 304 Stainless Steel case, 0-60Psi, +/-3-2-3%, 1/8" NPT Lower Mount

Amazon.com: MEASUREMAN 1-1/2" Dial Size, Glycerin Filled Fuel Pressure Gauge, 304 Stainless Steel case, 0-60Psi, -3-2-3%, 1/8"NPT Lower Mount : Industrial & Scientific

 

I am not reading all of that.

 

You could use a set up like what I'm running on my Camaro . You can easily view fuel pressure while the engine is under load

All the parts are available from Autometer and the Fuel line to the Guage is a -3AN hose

The gauge is mounted outside on the cowl panel

 

Another view of my fuel pressure gauge mounted on the cowl panel

 

Thanks for the idea and pics. Afraid I'll get confused and swap in a SBC. Oops. Then I'd be doing burnouts at every stoplight. "Sorry officer, I was just on my way to get a fuel pressure gauge when the back tires made all that smoke."

Yabba Dabba don't think I'll be running a fuel line to the inside of my cab lol. But that IS a nice little gauge to keep in mind for the engine bay, considering the price.