Stock FPR Problems: Who else...

stylEmon · 09-30-2008, 03:39 PM

Has anyone had problems with the stock FPR? I am curious because I am having issues with Fuel Pressure. I have an new filter, new lines from filter to rails, stock rails, 1600cc Bocsh secondaries, no pulsation dampener and stock fpr. (Walbro Hi Flow pump)

I noticed pressure issues, and took off the stock fpr. Replaced it with another stock one and am having the same issue. It's possible that both fpr's are faulty. I would even say it's probable.

Anyone have any insight or similar problems?
Obviously I want to upgrade to an Aeromotive with braided lines and AN fittings, but I don't want to spend the $600 on that right now..
Thanks

Ender · 09-30-2008, 06:04 PM

I don't have any personal experience with something quite like your situation, but I suspect you could have fuel flow issues when two of your injectors are rated for ~3 times the flow of the stock injectors. Are you seeing the pressure drop under light load or just when you're under boost? More specifics would probably help.

stylEmon · 09-30-2008, 07:15 PM

not sure why that would be a problem. I have a stand alone.

The main problem is at idle. The fuel pressure is 20 psi higher than it should be. Under load it raises a little more.

classicauto · 10-01-2008, 07:35 AM

Hmmm.

When did you first noticce the issue? Anything else changed/going on in that time period?

TehMonkay · 10-01-2008, 03:26 PM

It's either not bypassing enough fuel or there's a clog in the line or your fuel tank is very pressurized.

stylEmon · 10-01-2008, 04:42 PM

I think its always been a problem since I had this car running after the engine build.
It was masked by other problems, or unfinished tuning... make sense?

So what causes the tank to be pressurized?
We are suspecting that my walbro is faulty... I dont want to have to buy another one (since they offer NO warranty on it) but this may be the culprit...

classicauto · 10-02-2008, 07:50 AM

Quote:

Originally Posted by stylEmon

So what causes the tank to be pressurized?

Poor venting. Are you running a charcoal canister?

jgrewe · 10-01-2008, 06:44 PM

Take the top off of one of your stock FPR's and put an adjustable top that is made for a Honda on it. B&M makes them, they are about $50 from Summit racing.

Max777 · 10-12-2008, 03:11 PM

Quote:

Originally Posted by jgrewe

Take the top off of one of your stock FPR's and put an adjustable top that is made for a Honda on it. B&M makes them, they are about $50 from Summit racing.

i would like more detail on this? How is a Honda adaptor going to fit? Have you tried this yourself? I'm currently reading on zilvia about a DSM FPR adaptor that will fit nissan regulators, but nothing about the RX-7...

jgrewe · 10-12-2008, 10:43 PM

Quote:

Originally Posted by Max777

i would like more detail on this? How is a Honda adaptor going to fit? Have you tried this yourself? I'm currently reading on zilvia about a DSM FPR adaptor that will fit nissan regulators, but nothing about the RX-7...

The part number for the B&M part is #46057. It fits the '88-'00 Civic and '90-'00 Integra and NSX.

I have two race cars running these. You just grind the largest diameter rim of metal off to remove the non-adjustable cap. The metal is pretty thin but its good to keep it cool by dunking it in some water as you go, there is a rubber diaphragm that is inside that holds the fuel in. Just gently spin the FPR as you grind and peel the top off when you can. You will see when you get through the first layer of metal. The B&M top just clamps on the now "headless" stock unit with 4 allen screws and a C type lower piece.

Turn the top screw to set your pressure and then lock it down with the locking nut.

stylEmon · 10-02-2008, 08:48 AM

no...

TehMonkay · 10-02-2008, 02:51 PM

So, do you just have a cap on the line on the firewall going to it?

stylEmon · 10-02-2008, 03:45 PM

pretty sure its all capped... not positive. I'll have to check it out.
So high fuel pressure is a symptom of this? What other ill effects from running no canister? or capped off lines?

classicauto · 10-03-2008, 07:11 AM

Capping the vent for the tank will do some things......I'm not sure if high fuel pressure would be one of them, although its ENTIRELY possible.

All that vent's doing is essentially what the "vent" hole on a gas can does. It allows air to replace the space occupied by fuel once you start suckign fuel out. Does the reverse when you start pouring fuel in.

Its vented through the charcoal canister to keep fumes down, other wise you'd probably smell fuel coming out of the hole.

I've seen gas tanks collapse inwards from a plugged vent + heavy duty fuel pump.

stylEmon · 10-03-2008, 09:02 AM

yikes. makes sense tho.
Will look into that.

09-30-2008, 03:39 PM	#1
stylEmon Rotary Fanatic Join Date: Feb 2008 iTrader: (1) Posts: 125 Rep Power: 17	Stock FPR Problems: Who else... Has anyone had problems with the stock FPR? I am curious because I am having issues with Fuel Pressure. I have an new filter, new lines from filter to rails, stock rails, 1600cc Bocsh secondaries, no pulsation dampener and stock fpr. (Walbro Hi Flow pump) I noticed pressure issues, and took off the stock fpr. Replaced it with another stock one and am having the same issue. It's possible that both fpr's are faulty. I would even say it's probable. Anyone have any insight or similar problems? Obviously I want to upgrade to an Aeromotive with braided lines and AN fittings, but I don't want to spend the $600 on that right now.. Thanks __________________ See the Rebuild Process Here Curious About Deadband Timing? The BLACK BEAST is For Sale

09-30-2008, 07:15 PM	#3
stylEmon Rotary Fanatic Join Date: Feb 2008 iTrader: (1) Posts: 125 Rep Power: 17	not sure why that would be a problem. I have a stand alone. The main problem is at idle. The fuel pressure is 20 psi higher than it should be. Under load it raises a little more. __________________ See the Rebuild Process Here Curious About Deadband Timing? The BLACK BEAST is For Sale

10-01-2008, 03:26 PM	#5
TehMonkay Rotary Fanatic Join Date: Apr 2008 Location: Louisville, KY iTrader: (0) Posts: 302 Rep Power: 17	It's either not bypassing enough fuel or there's a clog in the line or your fuel tank is very pressurized. __________________ My car blows up everytime I start it, it's rotary

10-01-2008, 04:42 PM	#6
stylEmon Rotary Fanatic Join Date: Feb 2008 iTrader: (1) Posts: 125 Rep Power: 17	I think its always been a problem since I had this car running after the engine build. It was masked by other problems, or unfinished tuning... make sense? So what causes the tank to be pressurized? We are suspecting that my walbro is faulty... I dont want to have to buy another one (since they offer NO warranty on it) but this may be the culprit... __________________ See the Rebuild Process Here Curious About Deadband Timing? The BLACK BEAST is For Sale

10-01-2008, 06:44 PM	#8
jgrewe Rotary Fan in Training Join Date: Feb 2008 Location: On the Beach iTrader: (0) Posts: 59 Rep Power: 17	Take the top off of one of your stock FPR's and put an adjustable top that is made for a Honda on it. B&M makes them, they are about $50 from Summit racing. __________________ New rat from the sinking ship.

10-01-2008, 07:35 AM	#4
classicauto crash auto?fix auto Join Date: Feb 2008 iTrader: (0) Posts: 816 Rep Power: 17	Hmmm. When did you first noticce the issue? Anything else changed/going on in that time period?

10-02-2008, 08:48 AM	#11
stylEmon Rotary Fanatic Join Date: Feb 2008 iTrader: (1) Posts: 125 Rep Power: 17	no... __________________ See the Rebuild Process Here Curious About Deadband Timing? The BLACK BEAST is For Sale

10-02-2008, 02:51 PM	#12
TehMonkay Rotary Fanatic Join Date: Apr 2008 Location: Louisville, KY iTrader: (0) Posts: 302 Rep Power: 17	So, do you just have a cap on the line on the firewall going to it? __________________ My car blows up everytime I start it, it's rotary

10-02-2008, 03:45 PM	#13
stylEmon Rotary Fanatic Join Date: Feb 2008 iTrader: (1) Posts: 125 Rep Power: 17	pretty sure its all capped... not positive. I'll have to check it out. So high fuel pressure is a symptom of this? What other ill effects from running no canister? or capped off lines? __________________ See the Rebuild Process Here Curious About Deadband Timing? The BLACK BEAST is For Sale

10-03-2008, 07:11 AM	#14
classicauto crash auto?fix auto Join Date: Feb 2008 iTrader: (0) Posts: 816 Rep Power: 17	Capping the vent for the tank will do some things......I'm not sure if high fuel pressure would be one of them, although its ENTIRELY possible. All that vent's doing is essentially what the "vent" hole on a gas can does. It allows air to replace the space occupied by fuel once you start suckign fuel out. Does the reverse when you start pouring fuel in. Its vented through the charcoal canister to keep fumes down, other wise you'd probably smell fuel coming out of the hole. I've seen gas tanks collapse inwards from a plugged vent + heavy duty fuel pump.

10-03-2008, 09:02 AM	#15
stylEmon Rotary Fanatic Join Date: Feb 2008 iTrader: (1) Posts: 125 Rep Power: 17	yikes. makes sense tho. Will look into that. __________________ See the Rebuild Process Here Curious About Deadband Timing? The BLACK BEAST is For Sale