Question about 1987 Volkswagen Jetta

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There is a black box back by the fuel tank it is leaking gas what is it and is it possible to bypass it

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It's either a fuel flow sensor or the fuel pump. It's never a good idea to bypass anything on cars nowadays, as one component that fails or isn't in operation will affect the function of many things. Yes, we miss the good ol' dayz when a guy could just yank off wires and funny lookin' thingys, and the monster would stll roar...(in Ford's case, it'd roar even better!!)...but, hey, welcome to the new century...haha.

Posted on Jul 28, 2009

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We have a 1965 Ford 100 truck. The gas tank is behind the seat. It seems the gas is getting to the engine properly when we bypass the gas tank but not when the gas tank is hooked up. Any suggestions on why...


Could be an air leak in the tank. Or the fuel filter on the fuel float mechanism in the tank. It may be clogged. But that's a dangerous job.

Hope this helps.

Feb 19, 2015 | Ford Cars & Trucks

2 Answers

I would like to know what the code PO455 on a 2007 Mitsubishi Endeavor means.


Possible causes
- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
help.jpg What does this mean? Tech notes
The P0455 it's a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes.
help.jpg What does this mean? When is the code detected?
Evaporative Emission System (EVAP) control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors
P0455 Mitsubishi Description
This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition.
The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.

Read more: http://engine-codes.com/p0455_mitsubishi.html#ixzz3NlVyARyX

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Dec 30, 2014 | Cars & Trucks

1 Answer

Computer code 455


Possible causes - Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking The P0455 it's a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes.

When is the code detected? EVAP control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly. Possible symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors P0455 Buick Description This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition. The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.
if tightening the cap or replacing the cap does not help take your car to a shop to have it diagnosed as it requires special tools/equipment to test this and get an accurate results to find what needs replacing.

Oct 10, 2014 | 2004 Buick LeSabre

1 Answer

Honda code p1457


EVAP system, leak detected.

possible causes: gas cap loose or damaged, hose, fuel tank pressure sensor, evap valve, evap bypass solenoid, evap two-way valve, evap canister, evap vent valve, wiring.

Mar 20, 2014 | 1999 Honda Odyssey

1 Answer

Gas leaking from my tank switch


Use compression barb fittings on the pressure side with fuel injection line NOT REGULAR FUEL HOSE THE REGULAR HOSE WONT HOLD UP TO THE PRESSURE. The return line can be regular fuel line because of the low pressure.

Feb 02, 2014 | 1987 Ford F 150

1 Answer

How do i access the rear driverside brake line? there is fluid leaking all over the top of my gas tank.


If it is leaking on top of gas tank you need to drop fuel tank.Have some one install a new brake line ,bypassing the old one.,it is easyer than dropping tank Good luck

Dec 03, 2010 | 1995 Chevrolet Tahoe

1 Answer

I have this black box thats on my 2003 chevy silverado 1500 and i dont know what it is or does but is by fuel tank and it appears to be connected to it with a black tube


The black box is your EVAP charcoal canister, and the black tubes are the vacuum lines to your gas tank and engine which should be vacuum tight to ensure there is no leaks. Good luck and keep me posted.

Jan 08, 2010 | 2003 Chevrolet Silverado 1500

1 Answer

We have a 2001 sportage the gas tank is seaping on the top. Recently it started to start harder( turns over longer before firing). Today the check engine light came on and the car misses like its starving...


I dont know why gas would be "seeping". if its leaking, thats a problem. have the fuel pressure checked, if its low, the tank will have to come down for possible fuel pump replacement, and the leak found and corrected at the same time (possibly the fuel line is leaking back there?)

Sep 30, 2009 | 2001 Kia Sportage

1 Answer

Fuel leak


This part is a vent solenoid to the EVAP system. The solenoid is controlled by the PCM & vents fuel vapors to the charcoal canister. If fuel is leaking here you should first make sure your vent in the gas cap is not clogged.This could cause a vacuum in tank & possibly lead to your problem, or the solenoid may have been damaged when the tank was removed & replaced.

Jun 01, 2009 | 1999 GMC Jimmy

2 Answers

Fuel tank leaking how to solve problem gas is not pouring out but is seeping through bottom of tank There is fuel leaking from the top of the tank, is it a fuel overflow release or is the seal on the fuel...


If your gas tank is cracked or has a hole in it, you have to drain the tank, remove the gas tank and replace it, or have it repaired (if possible). If the gas tank is just leaking from the top and dripping along the side and to the bottom, you will still have to empty the gas tank, and remove it to get a good look at the condition of the gasket. It is not uncommon for these gaskets to become cracked or fragile over time because of the harsh chemicals and cleaning agents used in unleaded gas. If you do decide to have the gas tank removed, I would recommend replacing the fuel pump and fuel filter if your car has high mileage. Please rate this response if you found this helpful.

May 29, 2009 | 1995 Jeep Grand Cherokee

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