whats up with my FPR?
04-04-2005, 01:43 PM
#1
AudiWorld Super User
Thread Starter
Join Date: Nov 2000
Posts: 19,970
Likes: 0
Received 0 Likes
on
0 Posts
whats up with my FPR?
I'm using a custom fuel rail on another project car and employing the same 4 bar FPR for the 1.8t. I have a high pressure fuel pump and for some reason my fuel pressure gauge is showing 90psi! even at idle. this is my 2nd FPR too. is it possible my FPR cant regulate my HIGH fuel pressure? i thought I should ask first before I switch to alternative FPRs
thanks
Ed
thanks
Ed
04-04-2005, 08:29 PM
#5
AudiWorld Super User
Thread Starter
Join Date: Nov 2000
Posts: 19,970
Likes: 0
Received 0 Likes
on
0 Posts
arrgh i'm using the stock 4bar for the 1.8t
my goal was to run 70psi and short bursts with my megasquirt project but the pump i'm using was the upgrade i had for the A4.
here's my hackjob LOL
<img src="http://photopile.com/photos/idmorfe1/family/170884.jpg">
<img src="http://photopile.com/photos/idmorfe1/family/170885.jpg">
<img src="http://photopile.com/photos/idmorfe1/family/170886.jpg">
i guess i'll have to remove the FPR's o-rings and run another regulator :\
regards to everyone
here's my hackjob LOL
<img src="http://photopile.com/photos/idmorfe1/family/170884.jpg">
<img src="http://photopile.com/photos/idmorfe1/family/170885.jpg">
<img src="http://photopile.com/photos/idmorfe1/family/170886.jpg">
i guess i'll have to remove the FPR's o-rings and run another regulator :\
regards to everyone
04-05-2005, 07:13 AM
#6
cool! where does the 2nd tube hook up too? Is it possible that your gauge is reading 90 but the
FPR sees 58? Maybe hook up an inline gauge after the pump to verify. Is that plumbing where the gauge is at just open piping or do you have some sort of valving in it?
04-05-2005, 08:33 AM
#7
AudiWorld Super User
Thread Starter
Join Date: Nov 2000
Posts: 19,970
Likes: 0
Received 0 Likes
on
0 Posts
the lower/inner pipe is from the pump, then passes the gauge then the FPR
it flows from the side of the FPR casing and out the bottom - is that the right way to use this FPR? all the piping are atleast 3/8" and only the FPR is the obstruction after the gauge. i pressure tested it a while ago and saw that the FPR can only hold about 55psi of air pressure so I thought that it works. I then installed it and ran fuel. I have lots of low pressure fuel flow coming out of the FPR so looks like it cant keep up with what is actually being delivered. I'm using the 255 lph walbro unit btw 
too much probably?
thanks
too much probably?thanks
Trending Topics
04-05-2005, 12:32 PM
#8
Ahh ok. it wasn't clear the 1st time I looked at it. Yes, it's connected right. But the FPR ports
are probably too small to dump all that fuel. I assume if you remove the FPR valve you get 0 pressure - meaning there is no restriction on the plumbing before the gauge as you mentioned.
Looks like you need to either run a parallel FPR or just get a larger firewall mounted unit. I think your pump puts out almost twice the S4 pump
Looks like you need to either run a parallel FPR or just get a larger firewall mounted unit. I think your pump puts out almost twice the S4 pump
Thread
Thread Starter
Forum
Replies
Last Post
thewatcher101
A4 (B5 Platform) Discussion
1
06-23-2007 06:41 AM
ski ya later
A4 (B5 Platform) Discussion
3
04-09-2007 11:56 AM
silva
S4 / RS4 (B5 Platform) Discussion
8
12-19-2004 05:52 PM
