New fuel pump but doesn't start as quickly.

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Sep 9, 2012 | 08:31 PM

FluidCut

Thread Starter

3rd Gear

Joined: Jun 2012

Posts: 3

Likes: 0

New fuel pump but doesn't start as quickly.

I changed the fuel filter on my '95 because of a slight hesitation at cruising speed.

I found I had low fuel pressure coming from the fuel pump.

I changed the fuel pump, but now the car won't start as quickly.

Before the fuel pump change the car started imediately with a quick flick of the key.

Now it takes about a second of turning over before it fires up.

Also, after installing the new fuel pump the car still has a slight hesitation when cold (my mechanic scanned it recently, said it didn't have any problems.)

Anyone have any suggestions about either of my problems?

I'd appreciate any help.

Thanks,
Tom

Sep 9, 2012 | 09:24 PM

RUU

Melting Slicks

Joined: Jul 2008

Posts: 2,269

Likes: 142

From: Ottawa Ontario

What brand/model of fuel pump did you install?

Went to replace mine ('96/LT4) & the local parts store had Delphi FE0115 listed as the replacement. Installed it & car wouldn't start without a lot of cranking (plus it hesitated badly on WOT). Checked NAPA's website & they list the FE0114 as the replacement. Exchanged the FE0115 for a FE0114 and the car ran perfectly after.

Sep 9, 2012 | 09:43 PM

94z07fx3

Race Director

Joined: Dec 2006

Posts: 10,383

Likes: 4

Could also be the FPR letting go.

What is fuel pressure with new pump? with return pinched off? with vacuum line disco from FPR?

Wet gas in FPR vac line?

Sep 10, 2012 | 06:48 AM