Fuel Tank Pressure Sensor Problem - S-10 Forum
 
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post #1 of 13 Old 01-09-2009, 06:05 PM Thread Starter
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Fuel Tank Pressure Sensor Problem

i have just rplaced the fuel pump on my 98 s-10. now the check engine light comes on. when i get the diagnostics done on it it says that there is a pressure sensor problem. has anyone else had this problem and if so what could it be? and aslo were is the location of this sensor. please help

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post #2 of 13 Old 01-09-2009, 06:20 PM
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Re: Fuel Tank Pressure Sensor Problem

The pressure sensor is located on the top of the gas tank. What is the code number?

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post #3 of 13 Old 04-08-2009, 11:19 PM
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Re: Fuel Tank Pressure Sensor Problem

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Originally Posted by King_Ice_Flash2 View Post
The pressure sensor is located on the top of the gas tank. What is the code number?
I'm getting a p0452. evap low pressure. and my gas gauge stays on low fuel. could this sensor cause this?

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post #4 of 13 Old 04-09-2009, 12:16 AM
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Re: Fuel Tank Pressure Sensor Problem

leaking gas cap, evap vent solenoid, evap purge solenoid, leaking fitting, leaking tank, leaking line, or plugged evap line are also possibilities. If there isn't something obviously wrong with it, take it somewhere to get smoked.

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post #5 of 13 Old 04-09-2009, 07:48 AM
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Re: Fuel Tank Pressure Sensor Problem

....or bad electrical connection!!
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post #6 of 13 Old 04-09-2009, 07:19 PM
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Re: Fuel Tank Pressure Sensor Problem

isnt the pressure sensor on the very top of the fuel pump itself maybe they pinched the o-ring where the pump seats to the tank causing an evap leak. You could undo the bolts holding the bed on and start the pass side bolts a couple of threads and prop the bed up with a 2x4 and check the electrical connections and get to the pump to check the o-ring.

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post #7 of 13 Old 04-14-2009, 06:49 PM
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Re: Fuel Tank Pressure Sensor Problem

P0452 - Evaporative Emission Control System Pressure Sensor Low Input
thats the definintion of my code.... where are these sensors on the truck. It has to be a sensor, gauge was working mint one night, next morning its stuck on low fuel and ses light comes on

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post #8 of 13 Old 04-15-2009, 08:31 AM
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Re: Fuel Tank Pressure Sensor Problem

Quote:
Originally Posted by ~02DIME~ View Post
P0452 - Evaporative Emission Control System Pressure Sensor Low Input
thats the definintion of my code.... where are these sensors on the truck. It has to be a sensor, gauge was working mint one night, next morning its stuck on low fuel and ses light comes on
I had a simular problem and a new wire harness connector to the pump solved that.
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post #9 of 13 Old 04-15-2009, 06:24 PM
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Re: Fuel Tank Pressure Sensor Problem

I'm pulling a p0449 now as well as p0452. wheres my evap vent/solenoid?

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post #10 of 13 Old 04-15-2009, 08:09 PM
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Re: Fuel Tank Pressure Sensor Problem

A bad pressure sensor has it's own code. I put a airtex pump on mine and two weeks later the sensor quit, but I swapped it off the stock pump i removed and have had no more problems. An evap code is something completely different.

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post #11 of 13 Old 04-15-2009, 08:18 PM
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Re: Fuel Tank Pressure Sensor Problem

but if the vent or solenoid is stuck open couldn't that cause low pressure?

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post #12 of 13 Old 04-15-2009, 08:23 PM
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Re: Fuel Tank Pressure Sensor Problem

yes it can, but that is not a bad sensor, that is a sensor doing its job alerting to a problem in the evap system.

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post #13 of 13 Old 04-16-2009, 08:15 AM
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Re: Fuel Tank Pressure Sensor Problem

the PURGE solenoid is located on the pass. side
rear intake manifold.

the "VENT" solenoid is probably located above the
rear axle housing. it has about a half inch hose attached
to it, which leads back to the EVAP canister.
this solenoid is normally open, but is commanded shut by the
PCM once in a while to test the system to make sure its
airtight.

any other time, the tank, and EVAP canister should be at
ambient atmospheric pressure.

once the VENT is shut, the PURGE is opened briefly,
and the PCM uses the tank MAP sensor to monitor for a
slight pressure drop.

both solenoids can be bench tested for proper function,
by applying 12V to the terminnals and lisening for the "click"
they make when functioning properly.

without power applied, the PURGE sol. is normally closed,
and the VENT sol. is normally open.

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Last edited by Crew Cab Sonoma; 04-16-2009 at 08:24 AM.
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