Question about 1991 Toyota Supra

1 Answer

Missing vacuum hose from fuel pressure regulator on 1991 mercedes

The vaacuum hose which controls the flow of gas through the fuel pressure regulator is missing and i don't know where the other end goes. can you help please

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 148 Answers

The fuel pressure regulator vacuum hose usually runs to the upper air intake somewhere, check for the fitting on the upper air intake or throttlebody.

Posted on Feb 21, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Ihave a p0171,p0175 checked everything,replaced almost everything help

Rather strange combination of codes. First is running too lean, second is running too rich. It could be that the O2 sensors have failed and computer is cycling between lean and rich mix, but this should set a code for O2 sensor issue. The O2 sensors only regulate fuel mix within narrow ranges, but if you have not checked the output voltage sweep from them, might be worth a try. It would be helpful to know everything you have done so far.

Jan 01, 2015 | Cars & Trucks

1 Answer

Why does my 2005 lexus 330 es have poor acceleration?

Check the fuel filter, fuel pressure and fuel flow . Check the fuel pressure regulator, the rail pressure should rise when the gas pedal is jabbed , check the vacuum hose to the regulator is ok.

Sep 21, 2014 | 2005 Lexus ES330

1 Answer

I put gas in my ford f-250 how do i get it out

On the back of the engine there is a fuel pressure valve. Take the cover off and screw on a hose(like the one from the fuel pressure tester, or if you have an old air hose that has an end that screws on to a bike tire valve stems , that is the size of the the fuel pressure valve) Anyway, after you get a hose that you can screw on the pressure value, just turn your key to the on position, don't start it, just turn it so the fuel filter will kick in. The fuel will flow right out of the hose. So get some gas cans or whatever you are going to put the gas in and make sure you keep the end of the hose where the gas is coming out lower than the level of gas in the tank.

May 26, 2012 | 2006 Ford F-250 Super Duty

1 Answer

Free_Schematic_Diagram2000 toy tacoma fuel line

Don't have a diagram, but maybe I can help. Do you see the injectors? They are held on by o-rings to the "fuel rail". On a v-6, there would be two fuel rails connected together with piping. The line from your tank goes right into this fuel rail, and with the pump, keeps a steady pressure up to feed the injectors. On one end of the fuel rail is a small circular object with a vacuum line. That is your pressure regulator. It keeps the pressure constant, and the excess fuel goes out the regulator and into your fuel return line, back into the gas tank. The fuel rail would be on top of the intake manifold, bolted down. Hope this helps.

Oct 21, 2011 | Cars & Trucks

2 Answers

Burning gazoline and white smoke is coming out to tail pipe

This means its running rich, burnning to much gas. this could be due to a bad mass air flow sensor or bad o2 sensors or even a bad fuel pressure regulator, i would start with the fuel pressure regulator, remove the vacuum hose that goes to it and start the engine and see if gas is leaking from the port that vac hose goes to and if it is then replace that regulator and see how it runs from there. the rest you will need a scan tool to check the readings of the o2 sensors and mass air flow sensor. another thing is that if the engine is running rough it may be misfiring , skipping due to bad wires or sparkplugs. white smoke means alot of gas is being burnt and a regulator would be the first thing i would look at. good day.

Aug 17, 2011 | 2001 Chrysler Town & Country

1 Answer

New fuel pump, new cap, plugs and wires, clean air filter. My 98 Jimmy sounds like its missing, it boughs down. Mass air flow regulator? Fuel regulator? Also using a lot of gas lately.

You are right, all of the symptoms are pointing to a fuel pressure regulator. Also try inspecting your vacuum line going to your fuel pressure regulator.

Jun 24, 2011 | 1998 GMC Jimmy

1 Answer

It burns to much gas when its in park i give it gas and black smoke comes out the muffler

Check the fuel pressure regulator. On the 3.1 liter it's in the middle of the engine between rails. On the 3.4 it's at the end of the rail. pull the vacuum hose off, plug the hose with a golf tee, start the car, and see if gas comes out of the vacuum port on the regulator. If yes, replace regulator. If no, check fuel pressure at schrader valve on rail. Pressure should be 41-47 psi. If higher, replace regulator. Let me know if you have questions.

3.1 liter:

3.4 liter


Nov 17, 2010 | 1995 Oldsmobile Cutlass Supreme

1 Answer

Please help: 1992 Cadillac Deville: idles slightly rough, gas mileage has decreased. The check engine light goes on and off every once and a while. I got codes E13 and F48. Any advice is greatly...

E13: right bank O2 sensor, no data
F48: low refrigerant level in A/C system

Neither of these is likely to cause rough idle, but I would change the sensor.
If that cure it, great.

If not, make sure the vacuum hose on the fuel pressure regulator (at end of fuel rail) is tight at both ends and not cracked or leaking. Then pull the vacuum hose off the regulator and see if there is any fuel in the vacuum hose. If yes, replace regulator.
I also recommend cleaning up the intake side of engine with carb cleaner or equivalent: throttle body, Mass airflow sensor, EGR system, and PCV valve. Make sure EGR valve is operating.

If you have questions, please let me know.

fuel press reg:


Oct 24, 2010 | Cadillac DeVille Cars & Trucks

1 Answer

Truck trys too stall then goes and black smoke replaced fuelpump filter and TPsensor

check fuel pressure regulator for broken diaphram or busted vacuum hose. The regulator is at the end of the fuel rail--might be under the intake. If you can reach the hose, pull it off and start the engine to see if gas comes out of the regulator vacuum port. This indicates a busted regulator. A busted or loose vacuum hose can also cuse the engine to run rich, but not AS rich. Let me know if this isn't the problem or you have more questions.

Oct 22, 2010 | 1993 Chevrolet K1500

2 Answers

My car wiil not idle if i let off the gas it will shut off

maybe problems with a bad or dirty IAC valve,idle air control valve, try by doing service to the throttle body and the valve if it doesnt fix your problrm replace the valve, also you can check for a bad coil or fuel pressure

Mar 03, 2010 | 2002 Chevrolet Impala

Not finding what you are looking for?
1991 Toyota Supra Logo

Related Topics:

268 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toyota Experts


Level 3 Expert

76846 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8557 Answers

Are you a Toyota Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides