Question about 1990 Lexus LS 400

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I need to know what I need when replacing fuel pump. Sealants etc. to prevent leaks.

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You need nothing but the fuel pump. Do not use sealers. But make sure you sealed everything good. I leak will make you fail a smog test in Calif

Posted on Jul 17, 2009


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1 Answer

What is po171 code mean

PO171 means the engine is running lean(that means that the engine is getting too much oxygen rather than fuel)! Although replacing the 02 sensor has a chance of solving it, unfortunately it doesn't always do so.

Are there any symptoms? Rough running at any point? Loss in power? Idle problems?

This could be caused by many things: A vacuum leak, EVAP system not working properly, injector(s) clogged, or fuel pump/fuel filter issue.
There is also a very small chance that the O2 sensors become contaminated by certain types of silicone sealants installed in improper areas of the engine. I think that this last possibility would take a long time to show up in the computer.

Do you have access to an OBD2 scanner that shows live data? If so, I can give you more info how to try and pinpoint this problem.

Oct 09, 2014 | 2001 Ford Explorer Sport

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Is there a manifold gasket that prevents antifreeze leaks or could it be the radiator that is leaking

get the engine hot,
all external leaks , tell you , who leaks.
the cap pressure is 14psi, so it will leak at the pressure
and is easy to see, just look, dont rush, look.
and behold the item leaking, if confused take a photo of the leak.

you had green fluid on the ground. right.
why is this hard?
that puddle says , im leaking and need help fast.
as leaks tend to get worse. what a burned up engine???????

Aug 25, 2014 | 1999 Jeep Grand Cherokee Limited

1 Answer

Intake gasket replacment procuder

which engine, GM uses many called OPTIONs.
fixing engine requires you to know what is there.
we can not answer,

generic: ALL EFI CARS>
battery neg lug off.
fuel rail pressure discharged safely.
unplug all things attached, (look see em) cables, plugs. etc hoses.?
unbolt manifold
pull it.
clean surfaces.
see FSM or for other needs like RTV sealants. and where.
put on new gasket (up is up down is down)
put back intake, torque to FSM spec.
and reverse above.

easy huh?

Jun 17, 2014 | 2003 Pontiac Grand Am

1 Answer

The fuel pump went out in it and i need to know were the fuel pump is so i can fix it

Make sure your have correctly diagnosed the problem. There is a fuel pump Relay and another switch, an Inertia switch which can cut the power to the fuel pump.

You can get further info about these 2 switches by using the Browser and using each as a topic.

Now if your problem is really the fuel pump, then it is located in the fuel tank. Because of gas fumes, this is not a good repair for a novice. You need to drain the tank, unseal the old fuel pump and sender, and then put in the new parts.

Make sure the Battery is disconnected. But be aware that static electricity needs to be minimized. Ask about sealants for the gasket.

In some cases there are differences in fuel pumps. Best explanation is that different size engines need different capacity pumps. Then there are sometimes connection issues, large versus small pins, flat versus round pins. They do make harness adapters for these.

So I hope you find that an Inertia switch just tripped. They are located behind the front kick panels or in the rear cargo area behind a plastic cover. Push a Reset button and you are done.

Please rate my info.

Mar 09, 2013 | 1993 Ford Explorer Limited

1 Answer

Code p1494 grand laredo cherokee 2001

Here is the definition.
You'll need a shop manual for the procedures.

P1494 JEEP Description The Evaporative emissions system is designed to prevent the escape of fuel vapors from the fuel system. Leaks in the system, can allow vapors to escape into the atmosphere. The leak detection system tests for EVAP system leaks and blockage.

During the self-diagnostics, the Powertrain Control Module (PCM) first checks the Leak Detection Pump (LDP) for electrical and mechanical faults. If the first checks pass, the PCM then uses the LD pump to seal the vent valve and pump air into the system to pressurize it. If a leak is present, the PCM will continue pumping the LDP to replace the air that leaks out. The PCM determines the size of the leak based on how fast/long it must pump the LDP as it tries to maintain pressure in the system.
Read more:

Jan 27, 2013 | 2001 Jeep Grand Cherokee

2 Answers

Gas leaks out of the bottom, but only when I gas up. It doesn't leak at any other time, but it is preventing me from putting gas in the car. I took it to a named brand mechanic shop close to my home...

Its leaking from the tank?
You might need some new tubing.
If there is a hole in the tank try to find it and use putty/epoxy to seal it.
This is a simple leak, there is no need for an entire new fuel system

Sep 24, 2011 | 1996 Chevrolet Monte Carlo

1 Answer

Fuel pump is leaking gas. i just purchased jeep and filled it up and now it leaks gas at a quarter tank.

I'm going to assume you have a engine mounted mechanical pump? If the pump leaks fuel, nothing you can do except replace it. Many pumps not only leak externally but will leak into the engine oil as well. If you have injection, the pump is inside the tank and it cannot leak.
If the tank is leaking, you will need to buy a replacement tank. (most glues etc. won't hold on a tank and generally where there is one hole you will find many more).
Any problems or questions, just ask!!

Mar 28, 2011 | 1989 Jeep Cherokee

2 Answers

Why is my 2004 Lincoln Navigator missing or choking out with

It could be the filter agian; it could be the fuel pump, or it could simply be either a vacuum leak, EGR valve, fuel pump relay, O2 (oxygen) sensor(s), plugged injector (carburated, fuel injected); fuel pressure regulator, hole in a fuel line (look for fuel leaks under engine, and along side the driver side of car (under car).
I suggest having a fuel pressure test performed, and having the vacuum system tested, which should include EGR valve. Another possibilty, simply; could be the air filter. If it is ripped, torn, full of dirt and debris (from driving), it is possible it is clogged and is preventing sufficient air flow to the intake which will cause the car to hesitate, stall, idle roughly, or even die when accelerator pressure is released, or braking is applied. My 93 Subaru had this vary issue when I purchased it, and when upon checking the air filter, it looked as though rats or mice had begun digging (chewing) at the air filter. It was so torn that the filter was starting to get sucked up toward the intake which was plugging the air vent (hose), causing a lack of proper air intake (this mixes with the the fuel). Improper air/fuel mixture will cause a car to not even start, or stay running for a few seconds.
You can determine the fuel pump by having someone kneel down by the back of the car while you turn the ignition to the "on" position - DO NOT START the car -- when the ignition is turned to the "on" position, the fuel pump is actuated to draw fuel to the engine (this is a "primer" method"). If the person can hear the pump engage, then the pump is good. To ensure fuel pressure, after the car has sat for about an hour or so, locate the fuel rail (chrome, silver usually, sometimes black) and find the black screw port (usually black) and remove it. Carefully (cover with hand or rag etc) and depress the needle inside the port; if fuel sprays out (won't be too too much) then you have fuel pressure. If no fuel comes out, then move on to having the fuel pressure regulator and fuel pump relay replaced. Even if these are good, (no way to tell) - these being replaced will eliminate them as possible culprits.

The O2 sensors can be detected as a possible issue by having a diagnostics test performed (free usually at participating auto parts dealers; Napa, Baxter's, etc) *States, auto parts dealers vary.
Please let me know if you need further assistance.
Guru, Premium Expert @

Jun 28, 2010 | 2004 Lincoln Navigator

2 Answers

Fuel pump leaking a lot from a round hole facing the back

This is a common problem when the pump diaphragm fails. The fuel pump needs replaced. Lucky you this is a pretty cheap pump and easy to replace compared to newer cars.

Apr 12, 2010 | 1985 Ford F150

2 Answers

I have a 94 chevy s10 its leaking fuel out of what i believe to be the top of the fuel injector. I was told all that needs to be done is replace the o ring is this a difficult task.

Its not a bad job for what needs to be done. But it depends on the condition of the throttle body. I would order the seal/gasket kit for the injectors and the other kit, for the fuel pressure regulator. The reg. is on the back of the throttle body. Both areas have small torque screws holding them in place, both repairs require you to disassemble & reassemble the components evenly. Keep your work area clean, DON'T use sealants on the new gaskets, will clog injectors. If you need more info, let me know.

Jun 11, 2009 | 2000 Chevrolet S-10

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