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Why is gas in vacuum hose at MAP sensor

Vaccum hose run from pressure regulator

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Pressure regulator is defective and the vacuum line is sucking gas

Posted on Apr 12, 2015

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You cannot get fuel in a MAP sensor vacuum hose. If you have fuel in the vacuum supply hose to the pressure regulator the regulator is internally leaking. The engine should run rough/set o2codes/and possibly blow black smopke out tailpipe

Posted on Apr 12, 2015

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1 Answer

INERMITENT GAS SMELL


Faulty fuel pressure regulator.Pull the vacuum hose off the map sensor and if fuel runs out of it then the fuel regulator is bad.

Jan 09, 2012 | Chrysler Town & Country Cars & Trucks

1 Answer

Went to store and was shopping about an hour, when i went to leave, the car would not start. then i noticed a gas smell so i lifted the hood and seen a drip of gas coming from the boot on the throttle body...


Sounds like you have a bad fuel pressure regulator.Try this,pull the vacuum hose off of the fuel pressure regulator and if fuel runs out then the regulator is faulty.You can also pull the vacuum hose off the map sensor and if you see fuel run out the regulator is faulty.

Dec 01, 2011 | 1997 Buick LeSabre

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Exhaust pipe is blowing out a mist of black smoke


BLACK EXHAUST SMOKE IS A RICH FUEL MIXTURE.CAUSE BY WEAK SPARK IGNITION, FAULTY MAP SENSOR CHECK MAP SENSOR VACUUM HOSE AND ELECTRICAL CONNECTOR BECAUSE BAD MAP SENSOR WILL CAUSE RICH FUEL MIXTURE CHECK THE VACUUM LINE GOING TO FUEL PRESSURE REGULATOR, MAKE SURE FUEL PRESSURE REGULATOR GETTING VACUUM AT VACUUM LINE IF NOT LOOK FOR BROKEN OR DISCONNECTED VACUUM LINE TO FUEL PRESSURE REGULATOR, CHECK FUEL PRESSURE REGULATOR VACUUM LINE IF YOU SEE GASOLINE IN VACUUM DIAPHRAM TO FUEL PRESSURE REGULATOR REPLACE FUEL PRESSURE REGULATOR,CHECK THE EVAP CANISTER IF GAS SOAK IT WILL CAUSE RICH FUEL MIXTURE.

Aug 05, 2011 | 1995 Chevrolet Blazer

1 Answer

Smelling gas as i drive and parked


Sounds like you have a bad fuel pressure regulator.Try this,pull the vacuum hose off of the fuel pressure regulator and the map sensor and look for raw fuel and you see any run out of either of these then replace the pressure regulator.

Aug 04, 2011 | 1992 Chevrolet Cavalier

1 Answer

1989 Bronco runs rich. I've replaced Map sensor, TPS, IAT sensor, O2 sensor, and spark plugs but no solution. I can't find any vacuum leaks. Spraying ether around hoses doesn't change the rpms.


check that there is no fuel in the vacuum hose that is going to the fuel pressure regulator, if there is fuel in the vacuum hose replace the regulator.

Mar 17, 2011 | 1989 Ford Bronco

1 Answer

Runs poorly(very Rich, stumbles) when map sensor is plugged in, but runs smoother with it unplugged...new map sensor, EGR, TPS, O2, Fuel Pump, timing is right, good vacuum at map, no vacuum leaks,


If it is fuel injected you may have a bad fuel pressure regulator. The regulator is attached to intake manifold with a vacuum hose and the bladder sometimes fails causing gas to be dumped directly into the intake manifold. Only solution is to replace the fuel pressure regulator.

Dec 10, 2010 | 1994 Chevrolet Suburban

1 Answer

91 Chrysler New Yorker runs very rich. sometimes runs rough but usually seems to run ok but black smoke pours out the exhaust. If you accelerate hard it will leave a black streak on the pavement from the...


check that the map sensor vacuum hose is not leaking a leaking hose or a bad map sensor will cause the problem so will a bad cooant temp sensor. wireing to the above could be shorted or open.if a fuel injector were leaking or the controll wire to it were shorted to ground that also would cause it.if all the plugs were black when you changed them then look for an across the board problem like a sensor/vac hose/. if it had only one or two black plugs then look for grouned fuel injector wire or leaking injectors. one other possability could be a ruptured diaphram in the fuel pressure regulator. pull off vac hose and look for gas in the hose, start engine with hose off and see if gas comes out of the regulator if either have gas then replace regulator. oh forgot, that hose on the regulator has to have vacuum on it if it dont or hose leaks it will make fuel pressure to high and cause the problem. the exception to the vacuum at all times on the map censor and pressure regulator would be the 2.2/2.5l turbo. the vacuum to those censors is controlled with solonoids operated by the computer.
with engine off turn the key on/off/on/off/on and watch the check engine light it will start flashing the codes it will be like blink short pause then blink blink blink. that would be a code thirteen. if it has more than one code then after first it will blink out another always 2 digit codes if you miss count the blinks then turn off key for a minute and repeat. let me know what the codes are

Jun 09, 2010 | 1991 Chrysler New Yorker

1 Answer

My sparkplug keeps getting black, then the car begins to sputter


Car is running rich, can be a bad fuel pressure regulator or bad MAP sensor and can even be as simple as a bad vacuum hose that is disconnected. Regardless your engine is running rich (too much gas in to the engine from the fuel injectors) causing your plugs to turn black and foul, which is also causing your engine to sputter.
Start with the simple and check all your vacuum hoses, fuel pressure regulator and MAP sensor.
Good luck and keep me posted, be glad to help you get your car running 100% again soon.
Thank you for using Fixya

Mar 17, 2010 | 1995 Toyota Tercel

1 Answer

Car idles high and smell gas and cuts out when in gear


SCAN IT TO LOOK FOR MAP SENSOR PROBLEMS.AND CHECK TO MAKE SURE MAP SENSOR VACUUM HOSE IS RECEIVING VACUUM.IF ALL IS GOOD CHECK FOR OR LOOK FOR LOOSE VACUUM HOSE OR PVC STUCK OPEN.CHECK FUEL LINES GOING TO THE FUEL PRESSURE REGULATOR AND FUEL INJECTORS. FOR LEAKS.ALSO CHECK FUEL PRESSURE O RING IT WILL LEAK CAUSES FUEL ODOR.HAVE YOUR EVAPORATIVE CANISTER FILTER CLOGGED.YOU WILL HAVE FUEL ODOR.

Sep 21, 2009 | 1997 Chevrolet Cavalier

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