LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

My have found my hard starting issue, what do you think

Thread Tools
 
Search this Thread
 
Old 09-14-2003, 01:09 PM
  #1  
Registered User
Thread Starter
 
NVetro's Avatar
 
Join Date: Jun 2003
Location: New Jersey
Posts: 1,439
My have found my hard starting issue, what do you think

I have been having a hard delayed starting issue for awhile now. Basicly the car cranks fine, but i have to hold the key for a few seconds till she kicks over. So i just put a fuel presure guage on the shader valve, turned the key to the "ON" position and saw the presure shoot to 40, so the pump was done priming she droped from 40 to 0, in about 3 or 4 seconds. I turned her on, and at idle she was at 40 psi. I shut her off, and i know that the FP should bleed out SLOWLY, some people say 5 or 10 psi every hour or so, this droped from the 40 to 0, in about 3 or 4 seconds. Is this the fuel pump, injectors, or FPR? Thanks.
NVetro is offline  
Old 09-14-2003, 01:13 PM
  #2  
Registered User
 
i387's Avatar
 
Join Date: Jun 2001
Location: Bakersfield, California, USA
Posts: 78
Re: My have found my hard starting issue, what do you think

Originally posted by NVetro
I have been having a hard delayed starting issue for awhile now. Basicly the car cranks fine, but i have to hold the key for a few seconds till she kicks over. So i just put a fuel presure guage on the shader valve, turned the key to the "ON" position and saw the presure shoot to 40, so the pump was done priming she droped from 40 to 0, in about 3 or 4 seconds. I turned her on, and at idle she was at 40 psi. I shut her off, and i know that the FP should bleed out SLOWLY, some people say 5 or 10 psi every hour or so, this droped from the 40 to 0, in about 3 or 4 seconds. Is this the fuel pump, injectors, or FPR? Thanks.
Check your hoses first! I had the same problem, replaced the fuel pump, filter, regulator, and injectors trying to track it down.

It ended up being one of the fuel hoses in the fuel tank.

I did the trap door method on the fuel pump, so I was able to look inside the tank with the key on, and sure enough fuel was squirting everywhere.
i387 is offline  
Old 09-14-2003, 01:26 PM
  #3  
Registered User
 
simple's Avatar
 
Join Date: Apr 2001
Location: Springfield, IL
Posts: 2,195
I've heard something about the FPR bleeding down thru one of the vent tubes or something?
mine is doing the exact same thing yours is doing, it eventually killed my starter, i replaced it with an LT4 starter and the problem is still there, I dont want to burn up another one! any ideas about the vent line?
simple is offline  
Old 09-14-2003, 01:36 PM
  #4  
Registered User
 
gb95zconv's Avatar
 
Join Date: Jul 2000
Location: Woodstock,Georgia
Posts: 1,428
Originally posted by simple
I've heard something about the FPR bleeding down thru one of the vent tubes or something?
mine is doing the exact same thing yours is doing, it eventually killed my starter, i replaced it with an LT4 starter and the problem is still there, I dont want to burn up another one! any ideas about the vent line?
I belive your talking about the vacume line on the fuel regulator....pull it off and see if you have any fuel in it ...if there is you need to replace it.
gb95zconv is offline  
Old 09-14-2003, 01:47 PM
  #5  
Registered User
 
simple's Avatar
 
Join Date: Apr 2001
Location: Springfield, IL
Posts: 2,195
Originally posted by gb95zconv
I belive your talking about the vacume line on the fuel regulator....pull it off and see if you have any fuel in it ...if there is you need to replace it.
yeah that would be it! which one am I looking for tho?
thanks
simple is offline  
Old 09-14-2003, 02:02 PM
  #6  
Registered User
 
gb95zconv's Avatar
 
Join Date: Jul 2000
Location: Woodstock,Georgia
Posts: 1,428
Originally posted by simple
yeah that would be it! which one am I looking for tho?
thanks
It comes right off the fuel reguator which is located at the back of the intake on the fuel rail....its a small ~1/4 in line that runs to the passenger side of the intake.
gb95zconv is offline  
Old 09-14-2003, 02:05 PM
  #7  
Registered User
 
camaroz28_97's Avatar
 
Join Date: Feb 2002
Location: Wayne,NJ,USA
Posts: 484
i have the same problem. changed the FPR and fuel filter and it still does it???
camaroz28_97 is offline  
Old 09-14-2003, 02:25 PM
  #8  
Registered User
 
gb95zconv's Avatar
 
Join Date: Jul 2000
Location: Woodstock,Georgia
Posts: 1,428
Another issue could be the anti-drainback valve on the fuel pump....if its bad guess what...yep the fuel drains back to the tank.
gb95zconv is offline  
Old 09-14-2003, 02:32 PM
  #9  
Registered User
 
simple's Avatar
 
Join Date: Apr 2001
Location: Springfield, IL
Posts: 2,195
Originally posted by gb95zconv
It comes right off the fuel reguator which is located at the back of the intake on the fuel rail....its a small ~1/4 in line that runs to the passenger side of the intake.
just pull it off and see if it leaks?
simple is offline  
Old 09-14-2003, 02:33 PM
  #10  
Registered User
Thread Starter
 
NVetro's Avatar
 
Join Date: Jun 2003
Location: New Jersey
Posts: 1,439
I already have a new fuel filter, what should I change first? Fuel pump? BTW this ALL started after a 2 hour trip down the shore, so the pump could have gotten tired (104k miles on the clock). Whatcha think?
NVetro is offline  
Old 09-14-2003, 02:41 PM
  #11  
Registered User
 
sikz28's Avatar
 
Join Date: Apr 2001
Posts: 152
take a pair of vice grip pliers and CAREFULLY pinch off the fuel return line before the pressure drops off. If with the return line blocked this way the pressure holds your fpr is bad. if it still drops the fpr is ok and you need to look at the pump or lines in the tank.
sikz28 is offline  
Old 09-14-2003, 04:30 PM
  #12  
Registered User
 
shoebox's Avatar
 
Join Date: Dec 1969
Location: Little Rock, AR
Posts: 27,709
Originally posted by sikz28
take a pair of vice grip pliers and CAREFULLY pinch off the fuel return line before the pressure drops off. If with the return line blocked this way the pressure holds your fpr is bad. if it still drops the fpr is ok and you need to look at the pump or lines in the tank.
A little more elaboration on what sikz28 is saying:

Fuel system testing
shoebox is offline  
Old 09-18-2003, 12:17 PM
  #13  
Registered User
 
camaroz28_97's Avatar
 
Join Date: Feb 2002
Location: Wayne,NJ,USA
Posts: 484
anyone come up with anything???
camaroz28_97 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Alex Barnes
LT1 Based Engine Tech
16
01-24-2015 10:21 PM
94Z28LS1toLT1
Fuel and Ignition
4
01-17-2015 08:29 PM
Queens94z28
Parts For Sale
3
12-20-2014 09:11 PM
HuJass
Automotive News / Industry / Future Vehicle Discussion
18
06-24-2002 09:19 PM



Quick Reply: My have found my hard starting issue, what do you think



All times are GMT -5. The time now is 10:11 AM.