Automotive Forums .com - the leading automotive community online! Automotive Forums .com - the leading automotive community online!
Automotive Forums .com - the leading automotive community online! 
-
Latest | 0 Rplys
Go Back   Automotive Forums .com Car Chat > Chevrolet > Caprice
Reply Show Printable Version Show Printable Version | Email this Page Email this Page | Subscription Subscribe to this Thread
 
Thread Tools
Old 05-26-2016, 02:33 PM   #1
rachet16
AF Newbie
 
Join Date: Mar 2016
Location: tiffin, Ohio
Posts: 28
Thanks: 1
Thanked 0 Times in 0 Posts
94 Caprice no start

I have a 94 Caprice L99 4.3L V-8 won't start . Car has been sittig about a yearwith a full tank of gas. I parked it because I was having hard start no start issues during rainy or really humid weather assumed it was the opti distributor . The car would start after prolonged cranking. Saved up for parts now I have no fuel pressurs at the schrader valve I pulled the fuel filter it was clear no fuel there with the key on. I can feel the relay click and hear the fuel pump cycle but only after I ( bump the starter ) but no fuel pressure.
rachet16 is offline   Reply With Quote
Old 05-26-2016, 04:49 PM   #2
harleyguy
AF Regular
 
Join Date: Apr 2016
Location: McPherson
Posts: 123
Thanks: 0
Thanked 10 Times in 10 Posts
Re: 94 Caprice no start

First make sure you are getting 12v at the fuel pump. If you do you might have to pull the pump there is a filter (sock) on the pump that might be plugged.
harleyguy is offline   Reply With Quote
Old 05-26-2016, 04:52 PM   #3
rachet16
AF Newbie
Thread starter
 
Join Date: Mar 2016
Location: tiffin, Ohio
Posts: 28
Thanks: 1
Thanked 0 Times in 0 Posts
Re: 94 Caprice no start

Is there a check valve in the tank? Could I use compressed air blown back from the filter location to clear the filter?
rachet16 is offline   Reply With Quote
Old 05-26-2016, 07:40 PM   #4
rhandwor
AF Enthusiast
 
Join Date: Sep 2006
Location: Athens, Georgia
Posts: 4,662
Thanks: 0
Thanked 64 Times in 64 Posts
Re: 94 Caprice no start

Their should be a check valve in the pump.
rhandwor is offline   Reply With Quote
Old 05-27-2016, 08:43 AM   #5
Tech II
AF Fanatic
 
Join Date: Jul 2011
Location: Worcester, Massachusetts
Posts: 5,017
Thanks: 70
Thanked 618 Times in 610 Posts
Re: 94 Caprice no start

You can also spray carb cleaner into the intake, to see if the cars starts and runs(as long as you spray)......this will verify it's a fuel delivery problem.....

If you have battery voltage at the fuel pump circuit, with no pressure, then you need a pump.....I usually use a test light,,,,disconnect harness to tank...attach test light to the fuel pump circuit leads.....turn key to on...light should come on for 2 seconds and go out......then crank vehicle and it should be on steady......the brightness should be the same as when you put the test light directly across the battery....if it is dimmer, then could be a bad fuel pump relay(contacts), or a bad ground....
Tech II is offline   Reply With Quote
Old 05-27-2016, 08:50 AM   #6
rachet16
AF Newbie
Thread starter
 
Join Date: Mar 2016
Location: tiffin, Ohio
Posts: 28
Thanks: 1
Thanked 0 Times in 0 Posts
Re: 94 Caprice no start

Thanks TechII I think I read somewhere I can test for voltage from the connector in the trunk. Is that correct ? Do you know the color of the lead I need to check?
rachet16 is offline   Reply With Quote
Old 05-27-2016, 08:52 AM   #7
rachet16
AF Newbie
Thread starter
 
Join Date: Mar 2016
Location: tiffin, Ohio
Posts: 28
Thanks: 1
Thanked 0 Times in 0 Posts
Re: 94 Caprice no start

I did spray starting fluid and it started!
rachet16 is offline   Reply With Quote
Old 05-27-2016, 02:13 PM   #8
silicon212
Confoundingly Lucid
 
silicon212's Avatar
 
Join Date: Oct 2005
Location: Mesa, Arizona
Posts: 3,897
Thanks: 5
Thanked 30 Times in 30 Posts
Send a message via ICQ to silicon212
Re: 94 Caprice no start

I'd say it is your fuel pump not getting power. It could be the fuel pump itself, it could be the fuel pump relay or even the oil pressure switch on the engine. Check all wiring in affected areas. Verify that all body grounds are intact. Check fuses.

You can always probe the wiring from the pump itself to see if juice is getting to it - if so, suspect the pump.

When you turn the key, the fuel pump should kick on and shut back off after 2 seconds, if the engine is not started. The fuel pump also gets power passed through the oil pressure switch during cranking & if something is wrong there, no start.

Check: Connections, relay, oil switch, pump.
__________________
1988 9C1 - Modified LM1 @ 275HP/350TQ - TH700R4 - 3.08 8.5" Disc Rear - see it at http://www.silicon212.org/9c1!
2005 Crown Vic P71 - former AZ DPS - 4.6 liters of pure creamy slothness!
1967 El Camino L79/M20 old school asphalt raper

Remember - a government that is strong enough to give you everything you need, is also strong enough to take everything you have.
silicon212 is offline   Reply With Quote
Old 05-31-2016, 08:59 AM   #9
j cAT
AF Fanatic
 
Join Date: Oct 2007
Location: EVERETT, Massachusetts
Posts: 10,898
Thanks: 8
Thanked 432 Times in 431 Posts
Re: 94 Caprice no start

Quote:
Originally Posted by rachet16 View Post
I did spray starting fluid and it started!
since the starting fluid got it to run then a fuel problem.many NOW have wiring problems . the driver side of the trunk is how the pump wires are routed. the ground near the driver side trunk hinge is also a cause.

under the hood next to the fuse box is a red prime wire. connect a fused power wire to it this will keep the fuel pump on then check for voltage at along these in trunk wire that feeds the pump motor. the wire will be the biggest wire size .
Attached Files
File Type: pdf impala_9495engine_2of3.pdf (47.2 KB, 4 views)
File Type: pdf impala_9495engine_3of3.pdf (49.5 KB, 1 views)
File Type: pdf impala_9495engine_1of3.pdf (52.9 KB, 1 views)
j cAT is offline   Reply With Quote
 
Reply

POST REPLY TO THIS THREAD

Go Back   Automotive Forums .com Car Chat > Chevrolet > Caprice

Thread Tools

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



All times are GMT -5. The time now is 10:51 PM.

Community Participation Guidelines | How to use your User Control Panel

Powered by: vBulletin | Copyright Jelsoft Enterprises Ltd.
 
 
no new posts