BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 Lt1 no start issues

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96Brougham



Posts : 819
Join date : 2009-02-02
Age : 28
Location : Easton MA

PostSubject: Lt1 no start issues   Fri Jun 03, 2011 6:28 pm

96 Caddy Fleetwood

Had a long crank for a while, finally had non start 2 days ago. Brought it into work, replaced the pump. Got it all back together, still no start. Checked the fuse, relay, jumper wire to the pump, power/ ground on the connection to the sending unit. All were good, jumper wire wouldn't turn pump on.

So, took e tank down again today. Replaced the sending unit as it had a burnt connector at the top(in that 4 prong connector). Tested it ion the ground, pump shot out fuel. Not far, I'm not sure how much it should spray out of the line, but it shot probably 8 inches. Didn't look like a lot though?

So back in it went. Got the car down, STILL no start. WTF.

Tech under the car said he heard the pump running. Couldn't hear it going through the rails or anything though.

So, what else? Car will run all day long if I spray carb cleaner through the air intake.

Weak pump even though new?
Clogged fuel filter?

I'm at a loss.. Any help is appreciated.. Thanks guys
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toomanytoyz
Club President


Posts : 6870
Join date : 2009-01-20
Age : 40
Location : East Hampstead, NH USA

PostSubject: Re: Lt1 no start issues   Fri Jun 03, 2011 7:09 pm

What's your fuel pressure at the intake?

_________________
Bill "The Verb" Crovo - Resident Car Slut & Unicorn Hunter

A Toasted Marshmallow, A Long German, A Lame Suburban and expensive dreams...
Missing all my previous B's, D's and V... Sad
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GasTT



Posts : 2675
Join date : 2009-01-19
Age : 28
Location : Treasure Coast, FL

PostSubject: Re: Lt1 no start issues   Fri Jun 03, 2011 7:23 pm

There was no pressure at the intake. Could not hear fuel coming into the engine while jumping the pump test lead.
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Guest
Guest



PostSubject: Re: Lt1 no start issues   Fri Jun 03, 2011 9:33 pm

Jumping the pump test lead will only activate the pump. It will not engage the injectors. You will only here the injectors if the engine is running, but with the key in the on position, without start, you should here the pump prime for 2 seconds. If you have no guage to work with, push the schrader valve in to relieve pressure, then prime the pump again, and see if you have pressure back at the schrader valve. This could be a spark issue as well. Maybe the coil, or ICM. It could be a failed PCM as well.
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GasTT



Posts : 2675
Join date : 2009-01-19
Age : 28
Location : Treasure Coast, FL

PostSubject: Re: Lt1 no start issues   Fri Jun 03, 2011 9:39 pm

On my caprice when I jump the test lead I can hear the fuel coming into the engine bay.

This Fleetwood started right up ran fine with starting fluid. We had a guage on the schrader valve. It showed no pressure before during or after cranking. We are thinking the new pump is defective. Plenty of fuel in the tank.
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sdstick



Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: Lt1 no start issues   Fri Jun 03, 2011 10:10 pm

Sounds like the flex line is split & pisses hard when the pump feels back pressure while trying to pressurize the line. If the sender is new though that shouldnt be the case.

_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
Whine..eee...Silver LS6
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GasTT



Posts : 2675
Join date : 2009-01-19
Age : 28
Location : Treasure Coast, FL

PostSubject: Re: Lt1 no start issues   Fri Jun 03, 2011 11:14 pm

New pump and sender.
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96Brougham



Posts : 819
Join date : 2009-02-02
Age : 28
Location : Easton MA

PostSubject: Re: Lt1 no start issues   Fri Jun 03, 2011 11:21 pm

What's the pressure supposed to be at the rail?

Billy, I don't think it's PCM or icm related. Ran totally fun on carb cleaner, fired right up and idled perfect. It seems like fuel delivery issue..
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sdstick



Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: Lt1 no start issues   Sat Jun 04, 2011 7:25 am

Pressure should be around 40psi
I've never run a pump outside the tank to see how hard it pushes

_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
Whine..eee...Silver LS6
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1984twodoor



Posts : 4059
Join date : 2010-03-30
Age : 23
Location : Wilmington/Wakefield/Andover

PostSubject: Re: Lt1 no start issues   Sat Jun 04, 2011 8:47 am

Just a dumb guess but is there an inertia switch?

Hey anything to try and help right? Good luck with it! elephant
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Guest
Guest



PostSubject: Re: Lt1 no start issues   Sat Jun 04, 2011 9:12 am

If you can hear the pump, but no pressure, I would look at the clear hose at the sending unit to the pump, as Steve mentioned to make sure it has no cracks in it and is connected correctly. I would also look at the fuel filter. I have seen them so clogged, that no fuel got past them. But it was on a carbed car, not EFI.
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sdstick



Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: Lt1 no start issues   Tue Jun 07, 2011 5:58 am

So.....?????
OEM fuel filter?....Faulty harness?....ef'd up in tank line?
Defective pump?

_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
Whine..eee...Silver LS6
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GasTT



Posts : 2675
Join date : 2009-01-19
Age : 28
Location : Treasure Coast, FL

PostSubject: Re: Lt1 no start issues   Tue Jun 07, 2011 8:25 am

Defective aftermarket pump. Got a GM pump.
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sdstick



Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: Lt1 no start issues   Tue Jun 07, 2011 8:48 am

That sucz. Well, at least you know you have 100k trouble free miles Shocked

_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
Whine..eee...Silver LS6
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mega



Posts : 907
Join date : 2011-03-01
Age : 36
Location : Hyannis, ma

PostSubject: Re: Lt1 no start issues   Sun Jun 26, 2011 10:22 am

had same problem sending unit and pump were bad
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PostSubject: Re: Lt1 no start issues   Today at 11:02 pm

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