Filter/regulator issue - Team Camaro Tech
EFI in your modern Classic EFI conversions in early Camaros

 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old Aug 14th, 13, 05:01 PM Thread Starter
Moderator
Guess
 
HwyStarJoe's Avatar
 
Join Date: Jan 2001
Location: New Taxes York
Posts: 15,366
Filter/regulator issue

Here's a crazy one...
I found the source of the fuel odor and its one of the 2 lines or fittings going into the 2003 Corvette regulator I have mounted above the rear on the trunk floor. The regulator is screwed directly to the floor.

Yesterday when I was poking around trying to locate the source of the leak, I could make the fuel pump turn off while I was moving those 2 lines around (as it was running). I've been driving it without issues like the pump turning on and off by itself. its only when I move the 2 lines that it happens.

So tonight I took the regulator down to do 2 things... tighten the fittings on the lines going into it, and to make sure the bracket holding the regulator was well grounded to the body.
Now the pump won't come on at all. I hear the relay...or it could possibly be the pump for only a second when I turn the key on, but it doesn't run.
At least before I made sure the reg was absolutely grounded it would run. What did I do wrong?

*---------------------------------*


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Last edited by HwyStarJoe; Aug 14th, 13 at 06:25 PM.
HwyStarJoe is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old Aug 14th, 13, 06:11 PM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 32,010
Garage
Re: Filter/regulator issue

Let's see, battery power to the relay, ign sw closes the relay, relay sends power to f/pump, f/pump should pump if the return wire is grounded , at least, in theory.

Unless, the PCM controls the f/pump relay, by applying a low to one side of the relay coil as battery power is on the other side of the coil, then PCM should control the relay.

Then the question is, in the donor car, did the PCM control the relay or did the PCM control the pump?

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden Ö enjoy your next chapter.
Everett#2390 is offline  
post #3 of 6 (permalink) Old Aug 14th, 13, 06:22 PM Thread Starter
Moderator
Guess
 
HwyStarJoe's Avatar
 
Join Date: Jan 2001
Location: New Taxes York
Posts: 15,366
Re: Filter/regulator issue

The PCM doesn't control it. Strictly the ignition switch and relay.
It has power... all I did was crawl back under there and move the fuel lines a round a little and it worked... just like yesterday. So I took it for a very long drive, turned it off for a while, and the pump ran and started the car again just fine.

It has something to do with the two lines going into the regulator itself. The 2 lines are clamped in several places all the way from the tank so they can't move other than where I wiggle them right at the regulator. What I think is happening is if the 2 fittings right at the regulator touch each other, it works... if they're separated it disables the pump.
I grabbed the lines and squeezed them together, turned the key and the pump ran.

Odd... and scary. I'm wondering if there's some type of short or grounding going on with the two lines from the tank to the reg. The pump and fuel sender wiring are nowhere near the pump outlet and return fittings on the tank. It's not like they can be pinched... I made absolutely sure of that. I'm wondering if it could be internal at the pump itself now.
And what's even weirder is that once it's running and the car starts, the motion of the car moving doesn't break whatever 'circuit' is being completed to make the pump run.

Oh... and the seeping fuel has been fixed.

*---------------------------------*


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

HwyStarJoe is offline  
 
post #4 of 6 (permalink) Old Aug 14th, 13, 06:32 PM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 32,010
Garage
Re: Filter/regulator issue

The two hard lines are supplying a return for the pump through the clamps to the body.
You might have to ground the regulator/pump and ground the engine completing the circuit.
Separate the two lines and measure each line to ground.
The hot line, the one with power, needs to be grounded, or the reg/pump.

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
'
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden Ö enjoy your next chapter.
Everett#2390 is offline  
post #5 of 6 (permalink) Old Aug 14th, 13, 07:45 PM Thread Starter
Moderator
Guess
 
HwyStarJoe's Avatar
 
Join Date: Jan 2001
Location: New Taxes York
Posts: 15,366
Re: Filter/regulator issue

I didn't do any stray voltage checks yet... wanted to make sure the leak was fixed first.

The regulator and bracket are separated with a rubber gasket between them, but they're bonded together with a strap, then attached to the body at a clean bare metal mounting point.
The clamps are isolated with rubber. There's no metal-to-metal contact between them and the fuel lines.

I'll get back under there tomorrow and do the checks I should have done tonight... I was just too anxious to drive it without my eyes burning for once.

*---------------------------------*


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

HwyStarJoe is offline  
post #6 of 6 (permalink) Old Aug 15th, 13, 04:12 AM Thread Starter
Moderator
Guess
 
HwyStarJoe's Avatar
 
Join Date: Jan 2001
Location: New Taxes York
Posts: 15,366
Re: Filter/regulator issue

Well bummer... seems the leak is back.
Drove it to work this chilly morning and it was good for the first 4 miles.

*---------------------------------*


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

HwyStarJoe is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome