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Elektrobank
Joined: 19 Mar 2007
Posts: 142
Location: Pozzuoli,Napoli, Italy
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 Posted: Fri Aug 22, 2008 9:02 am Post subject: Fuel Pumps problem |
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Hi all!
during this month i can hear a fuel pump noise that comes from the rear of the car... and the car won't run well... the idle is poor and it is impossible to reach the max speed... around 220 km/h
the car is a 931 1980 completely standard
the noise is increasing in time, begin one months ago as a little noise and now is too loud and performance is not good
unfortunately here in italy is very difficult to find a CIS fuel tester for checking pressure....
i take a look around the forum and found that a pierburg fuel pump can (probably??) solve my problem...
http://www.allzim.com/acatalog/Pierburg_Fuel_Pump__911_77_80.html
http://www.shokan.com/catalog/product_info.php?products_id=451
someone tested that kind of pump? will need to modify something in the fuel lines? will i need a cis tester to adjust something??
please let me know
thanks in advance to all
Gianluca
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924T Dta inj + sequential LPG
Cosworth
MotoMorini 501
Moto Morini 350 K2
lot of fun but always on foot.... |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11723
Location: PacNW
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| Posted: Fri Aug 22, 2008 9:10 am Post subject: |
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That is the correct part. It bolts in, and works fine. . .better than stock, many say.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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Smoothie
Joined: 01 Jan 2003
Posts: 8032
Location: DE (the one near MD, PA, NJ)
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| Posted: Fri Aug 22, 2008 9:49 am Post subject: Re: Fuel Pumps problem |
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| Elektrobank wrote: | | someone tested that kind of pump? will need to modify something in the fuel lines? will i need a cis tester to adjust something?? |
My car's running a Pierburg pump. It's quieter than a new Bosch pump - should not require any fuel line mods as long as you get the correct Pierburg with same inlet-outlet sizes as the OE Bosch. CIS tester is good to have to verify pressures, but not absolutely necessary for adjusting (the only adjustment is system pressure (aka- primary pressure), which is adjusted by adding/removing shims (actually small washers) in the fuel pressure regulator), so it's unlikely for system pressure to get itself out of adjustment.
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"..it's made in Germany. You know the Germans always make good stuff."
'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox |
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Elektrobank
Joined: 19 Mar 2007
Posts: 142
Location: Pozzuoli,Napoli, Italy
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| Posted: Fri Aug 22, 2008 10:30 pm Post subject: Re: Fuel Pumps problem |
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| Smoothie wrote: | | Elektrobank wrote: | | someone tested that kind of pump? will need to modify something in the fuel lines? will i need a cis tester to adjust something?? |
My car's running a Pierburg pump. It's quieter than a new Bosch pump - should not require any fuel line mods as long as you get the correct Pierburg with same inlet-outlet sizes as the OE Bosch. CIS tester is good to have to verify pressures, but not absolutely necessary for adjusting (the only adjustment is system pressure (aka- primary pressure), which is adjusted by adding/removing shims (actually small washers) in the fuel pressure regulator), so it's unlikely for system pressure to get itself out of adjustment. |
Hallo Smoothie, thanks for the reply
so i will need to verify the connection sizes and threads before ordering the new pump, i'd like to know also where to buy a good CIS tester for the right price....
thanks
Gianluca
_________________
924T Dta inj + sequential LPG
Cosworth
MotoMorini 501
Moto Morini 350 K2
lot of fun but always on foot.... |
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Smoothie
Joined: 01 Jan 2003
Posts: 8032
Location: DE (the one near MD, PA, NJ)
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| Posted: Sat Aug 23, 2008 3:44 am Post subject: |
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Over here, www.JCWhitney.com is a good place to get a CIS tester. They were selling at approximately $55-$60 US last time I checked.
This would be the correct pump. The Pierburg part number is 7.21659.02 - it has a 12mm slip on inlet, and 10mm threaded outlet. A 10mm to 12mm adapter is included, but you probably won't be using that. Reuse the check valve from the outlet end of your old pump instead.
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"..it's made in Germany. You know the Germans always make good stuff."
'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox |
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Buwani 931
Joined: 31 May 2004
Posts: 308
Location: Napa California
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| Posted: Sat Aug 23, 2008 6:21 am Post subject: |
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| Smoothie wrote: | Reuse the check valve from the outlet end of your old pump instead.
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If he has the original pump, he might have the internal check valve.
Shawn
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1980 931
That's thirty minutes away. I'll be there in ten. |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11723
Location: PacNW
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| Posted: Sat Aug 23, 2008 6:47 am Post subject: |
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. . .and I was told the Pierburg had one integrated.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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Smoothie
Joined: 01 Jan 2003
Posts: 8032
Location: DE (the one near MD, PA, NJ)
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| Posted: Sat Aug 23, 2008 7:00 am Post subject: |
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Ya I've heard the built-in check valve theory too, but as far as I can tell, the pierburg doesn't have one - http://www.924board.org/viewtopic.php?t=24783&start=18
They do have an overpressure relief valve at the inlet end that I'm guessing some may be calling "check valve" by accident.
_________________
"..it's made in Germany. You know the Germans always make good stuff."
'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11723
Location: PacNW
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| Posted: Sat Aug 23, 2008 7:46 am Post subject: |
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Hmm guess I better dig one up.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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RobertN
Joined: 19 Apr 2015
Posts: 142
Location: Lisburn Co Antrim
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| Posted: Sun Dec 20, 2015 5:53 am Post subject: |
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| Smoothie wrote: | Over here, www.JCWhitney.com is a good place to get a CIS tester. They were selling at approximately $55-$60 US last time I checked.
This would be the correct pump. The Pierburg part number is 7.21659.02 - it has a 12mm slip on inlet, and 10mm threaded outlet. A 10mm to 12mm adapter is included, but you probably won't be using that. Reuse the check valve from the outlet end of your old pump instead.
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Hi smoothie, just noticed your reply from 2002!!
I'm checking if my pierberg pump had a built in valve, as there is only an adapted fitted and I believe I'm getting vapour lock warm start issues. Replacing new accumulator next week, but want to be sure check valve is integrated or not?
Cheers
Robert
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Robert.
Porsche 924 N/A 1984.
Electrical Engineering Sales to Control panel builders. |
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RobertN
Joined: 19 Apr 2015
Posts: 142
Location: Lisburn Co Antrim
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| Posted: Sun Dec 20, 2015 6:00 am Post subject: |
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Sorry Smoothie, I meant 2008 post!!
I bought a check valve but it's 12mm and too large for the outlet on pump. Need a 10mm to screw to the pump and 12mm for banjo fitting.
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Robert.
Porsche 924 N/A 1984.
Electrical Engineering Sales to Control panel builders. |
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