Fuel pump won't turn on

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Mar 20, 2007 | 10:37 PM

Konrad

Thread Starter

Burning Brakes

Joined: Aug 2006

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From: Central CT

St. Jude Donor '16

Fuel pump won't turn on

I finished putting the car backtogether after an accident (01z) and I can't get the fuel pump to turn on. The starter turns the motor but it won't start because the pump won't go on. I checked the ground in the rear and still nothing. If anyone has any ideas on what to check let me know.
Konrad

Mar 21, 2007 | 01:34 AM

CrazyChris

Racer

Joined: Aug 2005

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From: Springfield, MO

Have you checked the basics first... FP fuse and PCM/BCM security codes? GL

Mar 21, 2007 | 01:39 AM

white90conv

Burning Brakes

Joined: Nov 2002

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From: Los Altos CA

I think the fuel pump only goes on for a second or so when you turn the key and then it goes off until there is oil pressure. Are you sure it doesn't go on when you first turn the key?

Mar 21, 2007 | 05:36 AM

Blown 346

Melting Slicks

Joined: Sep 2006

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From: Rockford Illinois

I know after a certain MPH impact the fuel pump will shut off for safety reasons. You will have to reset the pump to turn it back on. Im not sure where the cut off switch is for it.

Mar 21, 2007 | 12:20 PM

Boob

Pro

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From: Austin TX

U check the grounds on the back of the heads?

Mar 21, 2007 | 05:18 PM

LoneStarFRC

Team Owner

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From: Dear Karma, I have a list of people you missed.

St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16

Quote:

Originally Posted by white90conv

I think the fuel pump only goes on for a second or so when you turn the key and then it goes off until there is oil pressure. Are you sure it doesn't go on when you first turn the key?

The fuel pump energizes for two seconds each and every time the key is turned to the "run" position, regardless of whether or not the engine is actually started. This is for pressurizing the fuel rail purposes.

Mar 21, 2007 | 10:36 PM

Konrad

Thread Starter

Burning Brakes

Joined: Aug 2006

Posts: 887

Likes: 15

From: Central CT

St. Jude Donor '16

Quote:

Originally Posted by CrazyChris

Have you checked the basics first... FP fuse and PCM/BCM security codes? GL

I didn't know there's a fuel pump fuse, but I did check the relay.
I do have PCM codes, I'll have to look into those

Mar 21, 2007 | 10:38 PM

Konrad

Thread Starter

Burning Brakes

Joined: Aug 2006

Posts: 887

Likes: 15

From: Central CT

St. Jude Donor '16

Quote:

Originally Posted by white90conv

I think the fuel pump only goes on for a second or so when you turn the key and then it goes off until there is oil pressure. Are you sure it doesn't go on when you first turn the key?

No it doesn't go on at all.

Quote:

Originally Posted by Boob

U check the grounds on the back of the heads?

I did check the ground. I actually checked the back of the fuel pump where the harness goes in and it's grounded, but it's not getting power.

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Mar 21, 2007 | 11:51 PM

hermit

Burning Brakes

Joined: Aug 2000

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From: Oregon City , Oregon USA

Quote:

Originally Posted by Blown 346

I know after a certain MPH impact the fuel pump will shut off for safety reasons. You will have to reset the pump to turn it back on. Im not sure where the cut off switch is for it.

Have you checked for this? As stated there is an enertia switch that shuts the pump off in the event of an accident so fuel doesn't keep spilling creating a fire hazzard. They are usually a pushbutton reset. I'm not sure about the Corvette.

Mar 22, 2007 | 08:47 AM

#10

Konrad

Thread Starter

Burning Brakes

Joined: Aug 2006

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From: Central CT

St. Jude Donor '16

Quote:

Originally Posted by hermit

I've looked everywhere and I can't find one, but I don't think they have that button.

Mar 22, 2007 | 10:24 AM

#11

jovette

Melting Slicks

Joined: Feb 2006

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From: Des Moines Iowa

I can't recall if the C5 has such a button either........Suggest checking the owners manual, if such a re-set button exists on an automobile, it's ususally indicated in the owner's manual somewhere.

Mar 22, 2007 | 11:20 AM

#12

87SAM

Safety Car

Joined: Jan 2001

Posts: 4,387

Likes: 691

From: Boise ID

Quote:

Originally Posted by CrazyChris

Have you checked the basics first... FP fuse and PCM/BCM security codes? GL

Check for codes, a lot has to happen to energize the pump.

Mar 22, 2007 | 11:41 AM

#13

Boob

Pro

Joined: Jun 2005

Posts: 734

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From: Austin TX

Quote:

Originally Posted by Konrad

No it doesn't go on at all.

I did check the ground. I actually checked the back of the fuel pump where the harness goes in and it's grounded, but it's not getting power.

There should be a ground for the wiring harness that leads to the fuel pump on the back of the passenger head. There is also a ground on the back of the driver head. I'd check both of those carefully for a wire that's not grounded.

Just had this issue on a 3rd gen f-body last weekend. It was the first place I checked and sure enough.

Mar 22, 2007 | 12:22 PM

#14

BlackZ06

Safety Car

Joined: Aug 2000

Posts: 4,933

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From: San Rafael CA

Quote:

Originally Posted by 87SAM

Check for codes, a lot has to happen to energize the pump.

You can spend HOURS futzing around with grounds, looking for reset buttons, etc.

Or, take two minutes and dump the codes and the car will tell you what the problem is.

Mar 22, 2007 | 03:08 PM

#15

Bull_in_a_china_shop

Racer

Joined: Aug 2003

Posts: 327

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From: Metamora IL

I had the same symptom after an engine swap. The grounds at the starter werent attached correctly. There was a post here that described what goes where at the starter

Mar 22, 2007 | 03:30 PM

#16

Konrad

Thread Starter

Burning Brakes

Joined: Aug 2006

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From: Central CT

St. Jude Donor '16

Thanks for the info everyone. Just to clarify, I am getting ground to the pump because I checked it at the pump harness. I'm just not getting power. If I run a power wire from the batt to the harness, it starts. So I know it's not a grounding issue, just power. But I will check all the codes right now and maybe that will tell me something.
Did anyone hear anything about synchronizing the computers???

Mar 23, 2007 | 05:06 AM

#17

BlackZ06

Safety Car

Joined: Aug 2000

Posts: 4,933

Likes: 30

From: San Rafael CA

Quote:

Originally Posted by Konrad

Thanks for the info everyone. Just to clarify, I am getting ground to the pump because I checked it at the pump harness. I'm just not getting power. If I run a power wire from the batt to the harness, it starts. So I know it's not a grounding issue, just power. But I will check all the codes right now and maybe that will tell me something.
Did anyone hear anything about synchronizing the computers???

If you have replaced computers such as the BCM and/or the SDM, they have to be programmed to match each other. For example, the BCM and PCM exchange a security password every time the car is started. The password is changed after each start, so if you replace the BCM it no longer passes a "correct" password, AND THE CAR CANNOT BE DRIVEN. Another example is the SDM, PCM, and BCM exchange data such as VIN and SDM identifier, and if they don't match codes will set (B1001).

That's why we're telling you to dump the codes. The codes will tell what the problem is. Without them, you're wasting time playing with wiring, etc. THE CAR WILL NOT RUN IF THE COMPUTERS ARE UNHAPPY. Dump the codes.

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