2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

possible fuel pump prob?

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Old Mar 31, 2004 | 04:20 PM
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possible fuel pump prob?

when my fuel is low (little less than 1/4 tank) and when i turn left, it fuel cuts! i am guessing its fuel pump. only when i turn left tho, can somebody help me on this thanks....oh its a 90 TII btw
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Old Mar 31, 2004 | 04:22 PM
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Your fuel baffle has probably broken off and is rattling around in the tank.
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Old Mar 31, 2004 | 04:23 PM
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More than likely just low fuel. Keep your tank full or get a gas tank insert. You could check your fuel pump in tank filter to make sure it is not too dirty.
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Old Mar 31, 2004 | 09:32 PM
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Sometimes a dirty in tank fuel filter can cause this.
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Old Apr 15, 2004 | 01:13 PM
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If you have no gas in the tank (me) will the pump not turn on.
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Old Apr 15, 2004 | 02:08 PM
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Originally posted by pinkfloyd
If you have no gas in the tank (me) will the pump not turn on.
huh? Are you asking if there is some safety switch if you have no gas? The answer to that is no, there is not so yes, it will pump.
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Old Apr 15, 2004 | 02:48 PM
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OK, you seem smart. answer me this. My fuel pump does not work, i have checked the realy and i feel it klicking. I do not have a afm hooked up. how can i test to see if the pump is getting power, witch fuses should i check. I checked all the fuses but mybe there is something else i could check. thanks
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Old Apr 15, 2004 | 02:52 PM
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left turn fuel cuts? Click <here>
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Old Apr 15, 2004 | 02:52 PM
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Originally posted by pinkfloyd
OK, you seem smart
That's debateable

Best place to check power at the pump is at the pump.

Pull the rear carpet, in the cargo area. You will now see a metal plate. Unscrew (bolt) whatever, and take it off. You will now see the plug and there will be 4 wires. 2 small blue ones and 2 fatter black ones. The black/white is the power and the black is ground. Check the power wire for voltage in the "ON"position. If it is like the Haltech it might only prime it so you will need to check while cranking as well.
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Old Apr 15, 2004 | 04:49 PM
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From: leawood,kansas
there is no power to my coils or my pump
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Old Apr 15, 2004 | 05:59 PM
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Your ENGINE fuse is popped. It's as simple as that.
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Old Apr 15, 2004 | 06:06 PM
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if you don't have the AFM hooked up, you need to jumper the check connector near the right strut shock tower to bypass the AFM switch circuit that allows the power to reach the pump once the engine's running...
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Old Apr 15, 2004 | 07:11 PM
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From: leawood,kansas
i did jump it, also the engine will not run, i alos dont have spark. I have checked all the fuses. any other ideas.
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Old Apr 15, 2004 | 07:36 PM
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From: FORT WORTH, TEXAS,USA
The key is turned to Start.

The 12v coming from the 100 amp fuse goes thru the ignition switch.

It goes from the ignition switch .....to the ENGINE fuse.

IF the ENGINE fuse is good, it then goes to the Coil Assy's.

For the fuel pump:

The voltage comes from the 100amp fuse, passes thru the ignition switch if it is to ON/START.

From the ignition switch it goes to ......the ENGINE FUSE.

It passes thru the ENGINE FUSE and goes to the Circuit Opening RElay, and if the conditions are right, like the key being held to START, the voltage goes thru the Circuit Opening Relay to the Fuel Pump Resistor Relay and on to the Fuel Pump.

The power for the coils and the power for the Circuit Opening Relay have a couple of things in common. One of which is the E....e fuse. Another is the ignition switch. and the 100amp fuse.

Free FSM are available on the internet, for free.
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Old Apr 15, 2004 | 08:12 PM
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From: Coldspring TX
heck, if all else fails (and you don't like reading wiring schematics), just pull the fuel line under the car off of the filter inlet, put the end in a bucket, and turn the key on!!! (kinda funny, but I actually did it once...)
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Old Apr 15, 2004 | 10:45 PM
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From: leawood,kansas
now i feel really stupid, where is this 100amp fuse. i know there is the 80A main fuse.
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Old Apr 15, 2004 | 10:51 PM
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yeh, if you have an S4 it's an 80A, in the middle of the fuse box in the engine compartment, held in by bolts...if that's blown, a whole lot of things won't be working- like the ignition switch, for one...
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Old Apr 15, 2004 | 10:59 PM
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From: leawood,kansas
ok ya its s4. i thought i was going crazy
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Old Jun 1, 2004 | 06:54 PM
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Originally posted by SureShot
left turn fuel cuts? Click <here>
site is down, can you tell me the jist of it?
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Old Jun 1, 2004 | 06:57 PM
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From: Surrey, B.C. Canada
Originally posted by Aaron Cake
Your fuel baffle has probably broken off and is rattling around in the tank.
what is a fuel baffle?
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