Hi,
Next step in my quest for a long-lasting FPR (the "oh God that one's gone after three days, hope the next one on the shelf is the one!!" kind of quest...), I've put a Bosch FPR that says 0 280 160 213 and I hope the 13 makes me lucky! When I look around on the net, I find that this unit is rated at 3 bars. When I measure the fuel pressure on the car (engine off), I get 3.2 bars with the pump on, then when it stops, pressure goes down to 2.8 and slowly back up to 3 bars, where it remains until I unhook the gauge.
As the last rest-in-peace-FPR (3 days on the car!!) was also rated at 3 bars but was measured at 3.5 with the pump on and 3.2 with the pump off, I'm wondering if this is normal or if it's a sign of wear from the FPR?Also, could it be sth else in my fuel system that causes the overpressure?
Now another question: do I use 3 or 3.2 bars as the value for calclation my new flowrate?
Thanks, Séb
FPR pressure acts funny
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- Helpful MS/Extra'er
- Posts: 65
- Joined: Wed Oct 27, 2004 10:00 am
- Location: Lausanne/Switzerland
FPR pressure acts funny
Normal cars go to paradise, 2cv's go everywhere!
And old volvo's are forever...
And old volvo's are forever...
Failing regulators
Regulators Failing ???? Huh ???
How are they failing ? this is really unusual , are you running a turbo ?
Maybe you have a defective "Pulsation Damper" they used to go out
pretty regular back in the 1980s .
Maybe bad "Check Valve" in the fuel pump not holding residual pressure ?
Fuel calculations are done at the pressure created with the pump running
and no engine vacuum attached to regulator (100 kPa) .
How are they failing ? this is really unusual , are you running a turbo ?
Maybe you have a defective "Pulsation Damper" they used to go out
pretty regular back in the 1980s .
Maybe bad "Check Valve" in the fuel pump not holding residual pressure ?
Fuel calculations are done at the pressure created with the pump running
and no engine vacuum attached to regulator (100 kPa) .
-
- Helpful MS/Extra'er
- Posts: 65
- Joined: Wed Oct 27, 2004 10:00 am
- Location: Lausanne/Switzerland
Hi Jim,
The to units have ben declared dead yhen I noticed fuel going up the vac line to the intake manifold... this has sth to do with the rubber membrane letting fuel throughm I guess.
I'm running the fuel system without a damper in the line, maybe I should and this could help??
Thanks, Seb
The to units have ben declared dead yhen I noticed fuel going up the vac line to the intake manifold... this has sth to do with the rubber membrane letting fuel throughm I guess.
I'm running the fuel system without a damper in the line, maybe I should and this could help??
Thanks, Seb
Normal cars go to paradise, 2cv's go everywhere!
And old volvo's are forever...
And old volvo's are forever...
A Fuel Pusation Damper is mostly for reducing noise when you have
a "Roller" type pump , it's not going to solve this problem .
He's what to do , disconnect your supply and return lines from the
Fuel Rails , next get a guage with a tee fitting sized to fit your lines ,
connect your supply and return lines to this tee with proper clamps .
DO NOT SPILL ANY GAS ON A HOT ENGINE , LET IT COOL .
yes , I've done it , it's not pretty .
Start your Fuel Pump , if you get more than 3 to 4 psi then your
return line is restricted somewhere , fix it .
Roller type fuel pumps can easily create 150 to 200 psi if you
pinch off the return line .
If you don't have a problem with this test and you are using
a stock regulator , the only thing I could tell you is you'll have to
go with an aftermarket adjustable Turbo/Blower regulator .
If you do this make sure it's a "Bypass" style regulator that sends
excess fuel back to the tank and that it has a connection for
manifold vacuum .
Lots of places that sell Turbo and/or Blower Kits have these , they
quite often have Stainless Steel Diaphrams that won't blow out .
a "Roller" type pump , it's not going to solve this problem .
He's what to do , disconnect your supply and return lines from the
Fuel Rails , next get a guage with a tee fitting sized to fit your lines ,
connect your supply and return lines to this tee with proper clamps .
DO NOT SPILL ANY GAS ON A HOT ENGINE , LET IT COOL .
yes , I've done it , it's not pretty .
Start your Fuel Pump , if you get more than 3 to 4 psi then your
return line is restricted somewhere , fix it .
Roller type fuel pumps can easily create 150 to 200 psi if you
pinch off the return line .
If you don't have a problem with this test and you are using
a stock regulator , the only thing I could tell you is you'll have to
go with an aftermarket adjustable Turbo/Blower regulator .
If you do this make sure it's a "Bypass" style regulator that sends
excess fuel back to the tank and that it has a connection for
manifold vacuum .
Lots of places that sell Turbo and/or Blower Kits have these , they
quite often have Stainless Steel Diaphrams that won't blow out .