Security.. Fuel Pump.. Problems!?

MSimpson · #1 06-09-2007, 12:11 AM

At Wal-Mart tonight I was sitting in my driver seat pressing the lock function of the vehicle joking with my girlfriend not letting her in the vehicle. Well the alarm started going off so I put my key in the ignition to start it and it wouldn't start. The car was cranking but acting like no fuel was getting to the engine. I had 2 of my buddies come and look at it. One seems to think that the aftermarket security alarm is keeping the fuel pump from delievery any fuel to the engine..

When I put the key in the on position I don't hear the winding of fuel pump.. We did spray some starter fluid into the engine and it fired up.. But quit shortly after...

I need some suggestions..

It's a 2002 Blazer Extreme with a Viper Security Alarm.. I don't know what model of the alarm is...

And I wasn't having problems before hand starting the car.. 88,000 miles..

Thanks..

sickcallawayc12 · #2 06-09-2007, 12:31 AM

Is the alarm designed/hooked up to disable the vehicle in case of theft? I don't think it's supposed to cut off the fuel pump even if it is. Check all fuses and wiring, make sure you didn't short or fry anything. Make sure you're getting spark. Then test the fuel pump.

twistedtech · #3 06-09-2007, 12:34 AM

Sounds like you messed with a good thing. I don't think anyone can tell you if the pump was wired into the alarm. Might have been. You will need to see if power & ground is getting to the pump. If it is, then you have a long road ahead of you. What is the alarm knocking out.

MSimpson · #4 06-09-2007, 12:40 AM

We have already tested for spark and everything is okay in that department.. Like I said we sprayed some starter fluid into the throttle body and the engine did kick but only long enough it to burn off the starter fluid.

I don't know much about the security because I bought the vehicle that way.

sickcallawayc12 · #5 06-09-2007, 12:48 AM

Quote:

Originally Posted by MSimpson

We have already tested for spark and everything is okay in that department.. Like I said we sprayed some starter fluid into the throttle body and the engine did kick but only long enough it to burn off the starter fluid.

I don't know much about the security because I bought the vehicle that way.

You're gonna have to find out as much as you can about that alarm system. It sounds like it disabled something, and if you were in the car when it was going off its certainly possible.

twistedtech · #6 06-09-2007, 01:13 AM

I didn't ask you if it was getting spark, I asked if the fuel pump was getting power. In the tank,can you hear it? Is there pressure?Are the injectors getting a pulse?. Like I said, you have a long road ahead. Shortcut= take out alarm and re-connect any connections it may have cut ( the installer may have run circuts through the alarm ).

MSimpson · #7 06-09-2007, 01:20 AM

No we can't hear the fuel pump engaging.. Can't check for power becaue the vehicle is not here with me at the moment... Will check tomorrow..

MT-2500 · #8 06-09-2007, 09:33 AM

There should be a reset procedure on the alarm system.
Alarm instruction manual may tell you.
Try locking doors with the ign key and unlocking them with the ign key.
Some after market alarms have a reset button on them.
If all else fails disconnect neg battery cable and hook it back up.
Then lock and unlock doors with a key.
Or if security light is staying on on dash after key is turned on try the key on 10 minutes and off and then on 10 minutes 3 times and see if it will start.

MSimpson · #9 06-09-2007, 06:04 PM

Something that has been brought to my attention is VATS.. I know you guys might say that since I have a aftermarket alarm that VATS had to have been by-passed but my remote start has never worked which makes me believe they didn't hook up the remote start..

Is it possible that VATS is keeping my vehicle from starting? And if so.. What do I need to do?

Craz · #10 06-10-2007, 01:31 PM

No.. I dont see the VATS being involved with the Viper. There should be a reset toggle or button of some sort that comes with that alarm system. It is designed to keep the basic thief from using the reset. It is usually in a hidden place like under the dash and such. You need to put your key in the ignition and hit that button at the same time to start the vehicle. This may or may not help. Also, some of those alarms in fact did shut down the fuel pump. Obviously to keep someone from stealing your vehicle. It is a long road to uninstalling that system. My advice would be to take it to a Viper distributor and have them help you figure it out. May or may not cost you a bit to do it...

Funny... Who got the last laugh in this scenario?? Bet your girlfriend is dieing over this one. Either way, I do not think its a standard vehicle problem, and you need to focus your thoughts on that alarm system. Good Luck !!

MSimpson · #11 06-10-2007, 08:25 PM

Update.. had a guy take it home and look it over.. He switched the coil and nothing changed.. Then he used a test light to see if power was being distributed to the coil.. And it come back as no power...

So suggestions..

MSimpson · #12 06-13-2007, 02:33 AM

So we took out the alarm system and that is not the problem.. We used a test light to test voltage across the Fuel pump coil.. I signal from the starter to the fuel pump relay isn't there.. What could be bad?? Starter switch?

Jari · #13 06-13-2007, 06:35 AM

Oil pressure switch is cutting out fuel pump when oil pressure is low. Maybe it's the oil pressure switch??

MT-2500 · #14 06-13-2007, 09:39 AM

Quote:

Originally Posted by MSimpson

So we took out the alarm system and that is not the problem.. We used a test light to test voltage across the Fuel pump coil.. I signal from the starter to the fuel pump relay isn't there.. What could be bad?? Starter switch?

Go back to the basic testing.
Are you getting spark to more than one spark plug?
Do you have 12 volt ign power to fuel pump relay?
Is the fuel pump turning on ign turn on 2-3 second prime?
MT

MSimpson · #15 06-13-2007, 09:58 AM

Quote:

Originally Posted by MT-2500

Go back to the basic testing.
Are you getting spark to more than one spark plug?
Do you have 12 volt ign power to fuel pump relay?
Is the fuel pump turning on ign turn on 2-3 second prime?
MT

We are getting spark..

The Fuel Pump relay has 4 pins one is ground, one stays hot all the time and the other two control the relay coil. The switch is getting power but, when the key is turnedto the on position, no power is going to the coil which allows power to be sent to the fuel pump.

No the fuel pump does nothing..

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