How to hook up an aftermarket AFPR and get rid off as many oem parts as possible?

[yannis-supras]

I will be messing with my engine bay again in the near future and among other things I will be sorting out my fuel mods. I have a SARD afpr which I'll be fitting with -6AN ss braided hoses & fittings. I also have the 255lt/h walbro fuel pump as well as a reusable racing type fuel filter.

I would like to know how people have hooked up their aftermarket AFPR's posting pictures if possible. What other mods can I perform now? J pipe, fuel dampener and any other restrictive piping/plumbing? Basically any oem stuff that I can get rid off without affecting driveability and functionality. Nice, smooth start ups and idle are essential to my liking so I don't wanna sucrifice them.

On this picture I have put in the red circle the parts that maybe I could override and get rid off. Also I was thinking of connecting the FPR supply line as the blue line indicates. What do you think, importand things I should be aware of?
Any opinions on dual feed fuel supply? I know the way of doing this is by threading a third hole at the middle of the fuel rail but that's about it .

I really need any information and guide lines on how to hook up which lines and where.

 

[dbsupra90]

yes you can get rid of all that. run the return line from the afpr to a barb fitting into the 23801F hose.
to get rid of the stuff on the feed side you need a 12mm x 1.25 to thread into the 23849A then run braided line directly to the rail. you will need a 14mm x 1.5 in place of the fpd (23270).

if you do it like this all of that stuff will be gone. the stock hard lines, banjo bolts, everything. all you will be left with is a braided line on the fuel feed junction to the rail. then a braided line from the fuel rail (12mm x 1.25 replaces 23280) to the afpr. then a braided line from the afpr to the stock rubber return hose.

 

[yannis-supras]

yes you can get rid of all that. run the return line from the afpr to a barb fitting into the 23801F hose.
to get rid of the stuff on the feed side you need a 12mm x 1.25 to thread into the 23849A then run braided line directly to the rail. you will need a 14mm x 1.5 in place of the fpd (23270).

if you do it like this all of that stuff will be gone. the stock hard lines, banjo bolts, everything. all you will be left with is a braided line on the fuel feed junction to the rail. then a braided line from the fuel rail (12mm x 1.25 replaces 23280) to the afpr. then a braided line from the afpr to the stock rubber return hose.

dbsupra90 thanks a lot. That clarifies things a lot. Althought could I not get rid off 23849A alltogether and run a straight hose there?

 

[dbsupra90]

dbsupra90 thanks a lot. That clarifies things a lot. Althought could I not get rid off 23849A alltogether and run a straight hose there?

sure thing.

well, you could but its a lot more involved. you would have to cut off the hard line feed from the tank and run a compression fitting to mate to a -6.

 

[yannis-supras]

sure thing.

well, you could but its a lot more involved. you would have to cut off the hard line feed from the tank and run a compression fitting to mate to a -6.

I'm afraid I'll have to do that and even more anyway. I'll be running 680cc injectors so after having a chat with a friend from the u.k. last night (group a) I found out that I better upgrade my fuel lines. So I'm going for -8AN supply line and -6AN return.

 

[dbsupra90]

that wouldnt hurt to upgrade. if you are doing all that you might consider -10 supply and splitting to a -6 at each end of the rail.

for what its worth, x-man was running the aeromotive pump, -10 feed split to dual -6, 680cc, and stock return with no problems.

i had been running -6 and stock return with no problems for the past couple years.

 

[yannis-supras]

that wouldnt hurt to upgrade. if you are doing all that you might consider -10 supply and splitting to a -6 at each end of the rail.

for what its worth, x-man was running the aeromotive pump, -10 feed split to dual -6, 680cc, and stock return with no problems.

i had been running -6 and stock return with no problems for the past couple years.

dbsupra90 I've only got the 255 walbro pump, isn't -10AN a bit overkill for my setup? I do like the dual feed idea though, could do it with the -8AN line splitted to two -6AN lines and keep the stock feed line -which is bigger than the stock return line- for return. Does the dual feed setup provide smoother fuel supply? Any other substuncial benefits?
What's your setup by the way?

 

[dbsupra90]

my prev setup was a walbro 255 hi press, -6 line from tank to rail, 680cc, stock return.
setup now is aeromotive, -10 line from tank to engine bay tee fitting to dual -6, 680cc, return from unused csi port to stock return line.

yes the -10 is overkill on the walbro, i didnt catch that part. the dual feed insures equal pressure/flow thru the rail to all cyl unlike the stock setup where you feed from one end and return on the other. this is why oftentimes people say #1 is the leanest, due to it is the last to get fuel.

that being said, im not sure you would want to feed 2 -6 off of a single -8. it may not have enough pressure behind it to keep up with the flow. i'll ask someone who knows more about this than i do.

 

[yannis-supras]

my prev setup was a walbro 255 hi press, -6 line from tank to rail, 680cc, stock return.
setup now is aeromotive, -10 line from tank to engine bay tee fitting to dual -6, 680cc, return from unused csi port to stock return line.

yes the -10 is overkill on the walbro, i didnt catch that part. the dual feed insures equal pressure/flow thru the rail to all cyl unlike the stock setup where you feed from one end and return on the other. this is why oftentimes people say #1 is the leanest, due to it is the last to get fuel.

that being said, im not sure you would want to feed 2 -6 off of a single -8. it may not have enough pressure behind it to keep up with the flow. i'll ask someone who knows more about this than i do.

So would it be better to run two -4AN lines after the -8AN main feed line instead of the -6AN ones? I guess that way there would be sufficient pressure on the two end hoses.

 

[X-man]

It would be better if your going to split the lines to run no#6's like Dave said as no#4 isn't but 1/4" line and would be somewhat of a restriction IMO even with two of them. I would either go with a no#6 or no#8 main line(definitely if you stay single feed).

 

[yannis-supras]

X-man the main feed line is definatelly going to be -8AN, I ordered a new -8AN Earl's fuel filter already. The -4AN lines was just a thought on what dbsupra90 (Dave I persume) suggested on the sufficient pressure issue and since I'm not experienced enough to make theses decisions by myself I just keep asking :biglaugh:. It's a good thing that people like yourself and dbsupra90 have chimed in since you have performed and tested these upgrades. -6AN for the dual feed lines it is sir!

 

[oscar35783]

I will be messing with my engine bay again in the near future and among other things I will be sorting out my fuel mods. I have a SARD afpr which I'll be fitting with -6AN ss braided hoses & fittings. I also have the 255lt/h walbro fuel pump as well as a reusable racing type fuel filter.

I would like to know how people have hooked up their aftermarket AFPR's posting pictures if possible. What other mods can I perform now? J pipe, fuel dampener and any other restrictive piping/plumbing? Basically any oem stuff that I can get rid off without affecting driveability and functionality. Nice, smooth start ups and idle are essential to my liking so I don't wanna sucrifice them.

On this picture I have put in the red circle the parts that maybe I could override and get rid off. Also I was thinking of connecting the FPR supply line as the blue line indicates. What do you think, importand things I should be aware of?
Any opinions on dual feed fuel supply? I know the way of doing this is by threading a third hole at the middle of the fuel rail but that's about it .

I really need any information and guide lines on how to hook up which lines and where.

I know this is an old thread but it's got some useful pix. Does any body know what size thread is part # 23280. I'm trying to find the right fitting for AFPR. Thanks.

 

[dbsupra90]

that is a 12mmx1.25. its a solex/del orto carb fitting: earl's part number 991945ERL

 

[oscar35783]

Thanks DB