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  #1  
Old 03-08-2011, 10:31 PM
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No power to fuel pump

Got a question,

as you can see ive got no power to my fuel pump. Checked the connection at the connector on the drivers side front fender.. still nothing. But the main fuse for the pump in the fuse box does have power.
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  #2  
Old 03-08-2011, 10:43 PM
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Checked what connection at the connector on the drivers side front fender ?

The BJB ( aka Battery Junction box / engine compartment fuse panel ) is there, but what connector did you take apart and check ?

Did you check the fuel inertia switch ?

Do you have a fuel pump relay in your MY ( Some MY, the fuel pump relay went to a built in relay - non serviceable ), not sure but I think it was 2003.
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  #3  
Old 03-08-2011, 11:23 PM
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The connector im refering to is the dual connectors that tie the wiring harness from the cab to the harness that runs along the frame rail. Mine has 2 connectors i believe some have 3. Black and grey. I do have a relay for the fuel pump in the BJB and it is getting power to one side of it. Comming from fuse 10
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  #4  
Old 03-09-2011, 07:20 AM
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Not sure where you got that from.

BJB Fuse #10 is Light Blue w/ Orange stripe wire to the fuel pump relay 1 side of the NO contacts.

Other side of fuel pump relay NO contacts is Dark Green w/ Yellow Stripe wire to the fuel inertia switch in the passenger side kick panel.

Other side of the fuel inertia switch to the fuel pump is Pink w/ Black stripe wire.

The ground on the fuel pump is operated by the PCM.

No Black w/ Gray stripe wire in any of it.
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  #5  
Old 03-09-2011, 08:07 AM
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Quote:
The ground on the fuel pump is operated by the PCM.
That should read "The ground on the fuel pump relay is operated by the PCM." The fuel pump itself has the low side hard-wired to ground.
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  #6  
Old 03-09-2011, 09:17 AM
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Quote:
Originally Posted by projectSHO89 View Post
That should read "The ground on the fuel pump relay is operated by the PCM." The fuel pump itself has the low side hard-wired to ground.
Thank you for the correction, that is what the post should have said. Typing too fast for my own good, and to the determinant of the member asking the question.

The Dark Green w/ Yellow Stripe wire also goes to the PCM ( confirm that the contacts are closed ?? )
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Old 03-09-2011, 11:48 AM
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Ahh this makes more sence.. My problem might be that my PATS system is going off. Probably the PCM isnt letting it make the ground connection on the relay. I'll have to check the inertia switch too.

Where are you reading all the wire colors/locations SSCULLY.. I need that book!

The grey/black is the colour of the accual connectors.. not a wire color. no biggie
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Last edited by 1fast4.6; 03-09-2011 at 11:52 AM.
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  #8  
Old 03-09-2011, 01:51 PM
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These are from the EVTM book. You can get one new form Helm Inc, used ones are usually on eBay. The Service DVD also has this, along with the service manuals, which older versions of those can be found on eBay.

Sorry, I took that as a wire color, not connector color.
If you turn the key from off to run ( do not start ) does the theft light go out ?

The relay, since you have the one that the fuel pump can be removed, if you pull the fuel pump relay, and jumper the normally open contacts, does the fuel pump run ?

Click the image to open in full size.
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Old 03-09-2011, 01:54 PM
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Well i found the problem.. two accually.. One was an easy one.. Found a ground wire that connects to the front left fender was hiding... Hooked it up.. relays start going crazy.. Still no pump. Checked the inerta switch.. It was tripped somehow! Fixed it and plugged it back in.. and wow that fuel pump is noisy!

Primed the system... crank crank crank..... nothing..

Now i have a new issue.. I have juice going to coils and injectors but no vroooom!
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Old 03-09-2011, 01:57 PM
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Quote:
Originally Posted by SSCULLY View Post
These are from the EVTM book. You can get one new form Helm Inc, used ones are usually on eBay. The Service DVD also has this, along with the service manuals, which older versions of those can be found on eBay.

Sorry, I took that as a wire color, not connector color.
If you turn the key from off to run ( do not start ) does the theft light go out ?

The relay, since you have the one that the fuel pump can be removed, if you pull the fuel pump relay, and jumper the normally open contacts, does the fuel pump run ?

Click the image to open in full size.
ahh sorry i didnt get to this closer so you didnt have to look it all up. Really apprecieate the help!
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  #11  
Old 03-09-2011, 02:02 PM
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When you turn the key from off to run ( do not start ) does the theft light go out ?
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Old 03-09-2011, 02:25 PM
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yes it does go out
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Old 03-09-2011, 03:56 PM
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Time to go old school, check for fuel pressure at the rail.

The 3 main items, air, fuel, spark.

From your post, it has spark, unless the intake has a rag shoved in it, it has air, which leaves fuel.
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  #14  
Old 03-09-2011, 04:08 PM
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I have good fuel pressure in the rails. Opened the bleeder valve (air stem) on the fuel rail till fuel was present.
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Old 03-09-2011, 04:11 PM
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You mean you have pressure. Unless you checked it with a gauge, it is a guess.

BTW: What started all this ( ground, fuel inertia switch, etc ).

Just curious how all this stuff happened.
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Old 03-09-2011, 04:11 PM


 
 
 
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