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#2292070 - 05/06/11 08:45 PM Fuel pressure
Inconel Offline
n00b

Registered: 05/04/11
Posts: 14
Loc: Austin, TX
I have a 2000 Crown Vic Sport with about 110,000 miles on it. I've recently had some starting issues and figured it was the fuel pump. I checked the fuel pressure on starting and, as expected, occasionally the pump doesn't prime (zero pressure). When it does prime and start, I noticed that I'm getting around 40 psi at prime and 30 psi when running. That seems pretty low and further confirmation that my pump is bad. Honestly, I don't know what is normal for these cars, but I was guessing it should be around 45 psi. Any thoughts?

Full disclosure: I've never changed the fuel filter. That will happen, probably along with the fuel pump.

Lastly, do most of you change just the pump or the whole assembly? It's a pretty big difference in price.

Thanks,
Molloy

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#2292083 - 05/06/11 09:18 PM Re: Fuel pressure [Re: Inconel]
SPM Offline
Over the Hill

Registered: 09/10/09
Posts: 1468
Loc: Wisconsin
Actually, your fuel pressure readings are spot-on. The pressure with key on engine off should be between 35-45 PSI, and with engine running 30-40 PSI. I replaced my fuel pressure regulator some time back because it was stuck and causing pressure upwards of 60 PSI (big time cause of my rich CEL codes), but with the new one in place my idling fuel pressure is right at 32 PSI.

I should also mention that, on occasion when I'm trying to check my fuel pressure, the gauge doesn't register the first time out. I've never been quite sure why, but it has happened. Just because it reads zero doesn't mean the pump isn't priming...in my case it was because the connection just didn't work the first time. Odd, but true.

How about you start with replacing the fuel filter, and see how it goes from there. A filter with 110K miles on it will almost certainly be clogged with gunk, and could eventually cause the demise of the fuel pump from overworking.

The one time I've changed a fuel pump wasn't on a CV at all, but a Chevy full-size K1500 Blazer. In that case I replaced the entire sending unit because the metal lines broke off when I tried to unscrew them. Most of the time there's no reason to replace the entire assembly unless it's damaged in some way.
_________________________

2005 Grand Marquis LS, 75K miles
2000 CVPI, 229K miles (Sold)

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#2292354 - 05/07/11 01:09 PM Re: Fuel pressure [Re: Inconel]
98P73_IRAQ Offline
Over the Hill

Registered: 04/26/08
Posts: 2931
Loc: iraq-baghdad-hell's street
change the fuel pump then check the pressure.

after i added liquer thinner to the tank the fuel pressure dropped to 25psi on idle and 30 prime that changing the fuel filter didnt help at all, replaced the fuel pressure regulator with a used one gave the same result, the fuel lines were ok so i have a bad fuel pump for sure. i crowled under and took out the fuel pump assembly and wow wow...the fuel pump filter in the tank was completly clogged with sand and crap! so i just replaced the filter (1$ only). now im getting 35 psi on idle and 45psi prime.
_________________________
http://www.supermotors.net/users/vic1992LX



1992 crownvic LX P74 (ex US DOD unit) SOLD 2009
1998 crownvic P73 (came from canada) SOLD 2014
1990 oldsmobile cutlass cierra 3.1L FE3 WORK VEHICLE
2007 toyota yaris 1.3L wife vehicle
2011 ford edge limited 3.5L AWD flooded (lifetime project)


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#2293018 - 05/08/11 02:25 PM Re: Fuel pressure [Re: Inconel]
Inconel Offline
n00b

Registered: 05/04/11
Posts: 14
Loc: Austin, TX
Well, I changed the filter (motorcraft) and the hard start symptoms got worse. So I got a new pump and screen (Bosch from Napa). Seems to have done the trick. Car is 11 yrs old with 110,000 miles so it's no big surprise that it needed a new one.

Have to say that the pump swap kicked my butt. I used to be a pretty good wrench, but I guess I'm getting old.

This site helped a lot though.

Thanks,
Molloy

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#2293081 - 05/08/11 04:26 PM Re: Fuel pressure [Re: Inconel]
98P73_IRAQ Offline
Over the Hill

Registered: 04/26/08
Posts: 2931
Loc: iraq-baghdad-hell's street
good to know, you are not getting old but the job is little PITFA.
_________________________
http://www.supermotors.net/users/vic1992LX



1992 crownvic LX P74 (ex US DOD unit) SOLD 2009
1998 crownvic P73 (came from canada) SOLD 2014
1990 oldsmobile cutlass cierra 3.1L FE3 WORK VEHICLE
2007 toyota yaris 1.3L wife vehicle
2011 ford edge limited 3.5L AWD flooded (lifetime project)


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