Racetronix key on position spikes to 62 then drops rapidly. Hard to restart hot car. - LS1TECH - Camaro and Firebird Forum Discussion



Fueling & Injection Fuel Pumps | Injectors | Rails | Regulators | Tanks

Racetronix key on position spikes to 62 then drops rapidly. Hard to restart hot car.

Reply
 
Thread Tools Search this Thread
Old 07-16-2017, 11:32 PM   #1
TECH Enthusiast
Thread Starter
iTrader: (1)
 
Join Date: Jan 2004
Location: Chicago
Posts: 716
Default Racetronix key on position spikes to 62 then drops rapidly. Hard to restart hot car.

Anyone with the Racetronix kit chime in and let me know if yours does the same?

Will see 62 psi on key on and then it drops down pretty quickly to 25. Will continue to bleed down to 10psi or so in 5-10 mins.

Removed injectors from intake and did key on with paper towels under them. Unplugged hardness for injectors. Did not notice any fuel leaking from injectors.


Have been having issues with restarting car after it has been warmed up. Cold start does not seem to be an issue. Car is cranking but not firing up. Starter is fine, HP tuners is seeing 150ish RPM when cranking.

Sometimes I am able to get it to start after cranking on/off like 5 times. Other times the car has to sit a bit before starting.
Monello is offline   Reply With Quote
Old 07-17-2017, 12:34 AM   #2
Truck Premium Sponsor
 
Join Date: Apr 2016
Posts: 2,056
Default

Sometimes that is either the fuel pressure regulator or the fuel pump check valve in the top of the pump.
tech@WS6store is online now   Reply With Quote
Old 07-17-2017, 02:40 AM   #3
On The Tree
iTrader: (4)
 
Join Date: Apr 2015
Location: Iowa
Posts: 183
Default

Good luck with Racetronix on support.

You can double check to make sure that the flex tube in the bucket assembly (The clear one from racetronix) is secure. Mine had a massive "leak" when it did this. I was able to get new tubes and re-crimped new one on extra tight and it at least holds to around 50 psi for starting.

I tested above by taking fuel assembly out of tank and having buddy turn key on and seeing if it "sprayed" out around those joints..... i will admit that i made a trap door so this is obviously easier to do if you don't have to take tank down lots.
klinznilk is offline   Reply With Quote
Old 07-17-2017, 02:48 AM   #4
Truck Premium Sponsor
 
Join Date: Apr 2016
Posts: 2,056
Default

If you need any help please email us

[email protected]
tech@WS6store is online now   Reply With Quote
Old 07-17-2017, 03:02 PM   #5
TECH Enthusiast
Thread Starter
iTrader: (1)
 
Join Date: Jan 2004
Location: Chicago
Posts: 716
Default

I did purchase a new fuel regulator. Will be replacing it when I pull the pump. Do you know what size the clamps are that come with the pump? Thinking I may not have clamped it good enough and may replace it.
Monello is offline   Reply With Quote
Old 07-17-2017, 04:29 PM   #6
Truck Premium Sponsor
 
Join Date: Apr 2016
Posts: 2,056
Default

They use an oetiker clamp

http://racetronix.biz/itemdesc.asp?ic=OCLMP12%2E8&eq=&Tp=
tech@WS6store is online now   Reply With Quote
Old 07-17-2017, 05:42 PM   #7
Teching In
 
Join Date: Jul 2014
Posts: 3
Default

I did this same swap over the weekend with the Hot Wire kit. and having the exact same issues as you. 62 psi then drops.
Also takes me 2 times turning key on to get to the 62psi....going to possibly change out the FPR tonight.

Last edited by AK99T/A; 07-17-2017 at 05:46 PM. Reason: added more info
AK99T/A is offline   Reply With Quote
Old 07-17-2017, 10:15 PM   #8
TECH Enthusiast
Thread Starter
iTrader: (1)
 
Join Date: Jan 2004
Location: Chicago
Posts: 716
Default

Let me know how it goes.

im in the same situation as you. Installed pump and hot wire kit a week ago. Going to try the fpr regulator on Wednesday and double check connections on pump.
Monello is offline   Reply With Quote
Old 07-18-2017, 02:15 AM   #9
On The Tree
iTrader: (4)
 
Join Date: Apr 2015
Location: Iowa
Posts: 183
Default

Are you using the Oetiker pliers to crimp it?

When i did my install and had the issue i tried crimping pliers and it didn't seem to seal as well.

I also tried the FPR to no avail (i had a spare)
klinznilk is offline   Reply With Quote
Old 07-18-2017, 09:16 AM   #10
TECH Enthusiast
Thread Starter
iTrader: (1)
 
Join Date: Jan 2004
Location: Chicago
Posts: 716
Default

Quote:
Originally Posted by klinznilk View Post
Are you using the Oetiker pliers to crimp it?

When i did my install and had the issue i tried crimping pliers and it didn't seem to seal as well.

I also tried the FPR to no avail (i had a spare)
Are you still having the issue with fuel pressure dropping right after key on?
Monello is offline   Reply With Quote
Old 07-18-2017, 09:39 AM   #11
On The Tree
iTrader: (4)
 
Join Date: Apr 2015
Location: Iowa
Posts: 183
Default

Mine is not a lot right at first but it still does drop some. I would say (would hve to confirm) that is drops to around 50psi after key on within probably 15 seconds
klinznilk is offline   Reply With Quote
Old 07-18-2017, 11:29 AM   #12
TECH Enthusiast
Thread Starter
iTrader: (1)
 
Join Date: Jan 2004
Location: Chicago
Posts: 716
Default

Does it stay at 50? How long until it drops down to zero.
Monello is offline   Reply With Quote
Old 07-18-2017, 11:41 AM   #13
On The Tree
iTrader: (4)
 
Join Date: Apr 2015
Location: Iowa
Posts: 183
Default

Don't remember off top of my head. ( barely drive it)

I can test it tomorrow if that helps
klinznilk is offline   Reply With Quote
Old 07-18-2017, 11:57 AM   #14
Truck Premium Sponsor
 
Join Date: Apr 2016
Posts: 2,056
Default

The check valves in the top of the new pumps can be finicky. They basically pull right out and you can check for any debris in there then seat them back into the pump (id recommend vaseline or lube) then see if that fixes the issue.
tech@WS6store is online now   Reply With Quote
Old 07-18-2017, 12:01 PM   #15
On The Tree
iTrader: (4)
 
Join Date: Apr 2015
Location: Iowa
Posts: 183
Default

Quote:
Originally Posted by [email protected] View Post
The check valves in the top of the new pumps can be finicky. They basically pull right out and you can check for any debris in there then seat them back into the pump (id recommend vaseline or lube) then see if that fixes the issue.
Race recommended this to me ...... made no difference and there was zero debris in mine. I fought them non stop WORTHLESS customer support and customer is always wrong.....
klinznilk is offline   Reply With Quote
Old 07-18-2017, 12:04 PM   #16
Truck Premium Sponsor
 
Join Date: Apr 2016
Posts: 2,056
Default

Did you buy a whole new fuel pump module as well or just the upgraded pump?
tech@WS6store is online now   Reply With Quote
Old 07-18-2017, 12:07 PM   #17
On The Tree
iTrader: (4)
 
Join Date: Apr 2015
Location: Iowa
Posts: 183
Default

I bought BOTH

I tried just the upgraded pump.... they told me lots of excuses... new tubes. new clamps and eventually a new bucket.... lots of money wasted. I am just glad it holds enough to start and stays at pressure when running.
klinznilk is offline   Reply With Quote
Old 07-18-2017, 12:09 PM   #18
Staging Lane
 
Join Date: Nov 2016
Location: switzerland
Posts: 92
Default

what regulator are you using? i seems to be normal, that high performance regulators bleed down fast. i just found that out myself.
Dian is offline   Reply With Quote
Old 07-18-2017, 12:12 PM   #19
Truck Premium Sponsor
 
Join Date: Apr 2016
Posts: 2,056
Default

Whom did you get the new module from?
tech@WS6store is online now   Reply With Quote
Old 07-18-2017, 12:22 PM   #20
On The Tree
iTrader: (4)
 
Join Date: Apr 2015
Location: Iowa
Posts: 183
Default

Quote:
Originally Posted by [email protected] View Post
Whom did you get the new module from?

old gm stock
klinznilk is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
PLEASE HELP / Fuel Issues: Pump primes but can not keep idle & dies Mert Celet Fueling & Injection 12 05-12-2017 01:18 PM
PLEASE HELP / Fuel Issues: Pump primes but can not keep idle & dies Mert Celet PCM Diagnostics & Tuning 2 05-01-2017 08:42 PM
Tuner having problems getting the car to start up right. RebelExtrm02 PCM Diagnostics & Tuning 8 07-24-2016 05:48 PM
Wont turn over 98 Z28 LS1 A4 I-Race-NE1 General Maintenance & Repairs 1 05-03-2016 02:02 PM
Wont turn over 98 Z28 LS1 A4 I-Race-NE1 PCM Diagnostics & Tuning 0 04-17-2016 01:44 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 09:46 PM.


 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: