Topic: Fuel Pressure Regulators

[sharpxmen]

Sure enough, there was another O-ring on the fuel rail.  Although interesting enough, I tried reusing my old one and it seems that my FPR might be a smidgen wider or the O-ring compressed more.  This caused a fuel leak of course.  So I used the one that make with the new FPS and it seems to work.  Is the FPR supposed to be able to rotate?  The bracket doesn't compress down to where the FPR doesn't move.  Although 9PSI isn't much so I doubt it's an issue.  I just didn't bother checking to see if mine would rotate as well.  With 2 O-rings it was on nice and tight.

Here's what it looks like.  I chopped off 2 barbs on the fitting since it was too long and I didn't want to stretch the plastic tubing too much.

it shouldn't move, but it might be that the bracket bent a little when you had the second o-ring in - so if it was nice and tight with 2 of them throw the second one in as well - if it doesn't leak it can't hurt.

the pressure there is 43psi not 9psi (that was the answer to how much vacuum the engine makes).


that turned out nice and clean with the barb cut and the matching rubber end  

EDIT: it looks like there's a little space between the rim of the FPR and the rail, so most likely the bracket bent a little that's why you can move it (it should move but not freely, keep in mind that this is larger and has the fitting on as well which makes it easier to turn compared to the tiny stock one)

[Jeffy]

there are 2 o-rings on top of the little plastic rings - usually the small one remains in the rail (and it is far easier to install that way) and the large one comes off with the FPR. if it works just leave it, should be fine

but for sure you have another o-ring in there, would leak big-time otherwise.

Wait, there are supposed to be two rubber O-rings on top of the plastic ring?  My OEM setup seemed to only have one plastic O-ring and that is from the factory.  This is what's confusing me.  I have one O-ring like how the Factory setup was.  The O-ring is retained inside the rail and only the plastic ring is on the FPR.

The manual only shows two O-ring, one small and one large.  I take it the smaller one is still inside.  It doesn't really say anything about the plastic spacers.  So currently I have two O-rings.  The gap with the images is with 3 O-rings.  Two of the larger ones which is why it's not seated all the way.  I don't think the bracket bent any when I seated all 3.  The FPR is able to rotate if I try to force it.  It's not as loose as it was with the original O-rings only.

[sharpxmen]

Wait, there are supposed to be two rubber O-rings on top of the plastic ring?  My OEM setup seemed to only have one plastic O-ring and that is from the factory.  This is what's confusing me.  I have one O-ring like how the Factory setup was.  The O-ring is retained inside the rail and only the plastic ring is on the FPR.

there is only one o-ring on top of each of the 2 plastic rings/spacers

usually the little o-ring remains in the rail when you remove the FPR, the larger one sometimes comes out on the FPR, sometimes stays in the rail - seen both.

what i meant when i said there's another o-ring in there was in response to your post as your FPR did not have one on it when you removed it just the plastic spacer ring (and if there was no o-ring in the rail it would leak).

[Jeffy]

there is only one o-ring on top of each of the 2 plastic rings/spacers

usually the little o-ring remains in the rail when you remove the FPR, the larger one sometimes comes out on the FPR, sometimes stays in the rail - seen both.

what i meant when i said there's another o-ring in there was in response to your post as your FPR did not have one on it when you removed it just the plastic spacer ring (and if there was no o-ring in the rail it would leak).

Ok, then it should be good with 2 O-rings.  I'll watch for leaks, I don't think it's leaking though.  When I had the factory large O-ring it did indeed leak so I swapped back to the one that you sent and it seems to have stopped.

[sharpxmen]

The manual only shows two O-ring, one small and one large.  I take it the smaller one is still inside.  It doesn't really say anything about the plastic spacers.  So currently I have two O-rings.  The gap with the images is with 3 O-rings.  Two of the larger ones which is why it's not seated all the way.  I don't think the bracket bent any when I seated all 3.  The FPR is able to rotate if I try to force it.  It's not as loose as it was with the original O-rings only.

the manual is correct

it will move if you try to force it, same with the stock one but if it was installed for a long time things would stick to each-other not to mention being smaller diameter, so i think that's fine.

[Jeffy]

So I was able to drive around town.  No leaks so that's good, I don't like to be on fire.  There is definitely a bump in torque and hp in the lower RPM's.  The power-band is much smoother which is nice.

[sharpxmen]

So I was able to drive around town.  No leaks so that's good, I don't like to be on fire.  There is definitely a bump in torque and hp in the lower RPM's.  The power-band is much smoother which is nice.

did you get a chance to redo the test you did with the stock one?

glad to hear you're not leaking

EDIT: if you get your hands on a pressure gauge try to bump it up in pressure and see how that feels too (45 or 46 should be ok still but i wouldn't go higher than that).

[Jeffy]

did you get a chance to redo the test you did with the stock one?

glad to hear you're not leaking

EDIT: if you get your hands on a pressure gauge try to bump it up in pressure and see how that feels too (45 or 46 should be ok still but i wouldn't go higher than that).

Hopefully, I'll do one of the roads tomorrow and the other on the weekend.

Is there a gauge I can leave mounted to the schrader valve on the fuel rail?

[sharpxmen]

Hopefully, I'll do one of the roads tomorrow and the other on the weekend.

Is there a gauge I can leave mounted to the zerk on the fuel rail?

yes, you can get an -4AN female to 1/8'' NPT female adapter and one of the small pressure gauges (0-60 psi)

at a minimum something lilke this

4AN female to 1/8'' NPT adapter http://www.summitracing.com/parts/EAR-916104ERL/ - $7
1/8'' female to 1/8 female adapter http://www.summitracing.com/parts/FRA-491001/ - $3
0-60 psi fuel pressure gauge http://www.summitracing.com/parts/SUM-800160/ - $18
$28 in total

you might look for them locally as the shipping is something like $10

you might find a -4AN to 1/8'' npt female to female and that could cut the cost a bit and might also want to look for an elbow rather than the straight 1/8 to 1/8 female adapter: something similar to this http://www.summitracing.com/parts/FRA-491601/, but this one is $11 and seems overpriced to me (you can probably find it for $3 or so at a hardware store).

[Jeffy]

Hmm, there doesn't seem to be any -4 AN Female to 1/8 in. NPT Female fittings.

Why go with a 90 elbow?  Wouldn't it be OK to have the gauge stand upright so I won't have to climb into the engine compartment to read it?


***edit:  OK, I see those gauges have the 1/8" Male on the backside of the gauge. 

[Jeffy]

This is pretty ugly: http://blog.hemmings.com/index.php/2009/05/11/hmx-checking-fuel-pressure/

[sharpxmen]

Why go with a 90 elbow?  Wouldn't it be OK to have the gauge stand upright so I won't have to climb into the engine compartment to read it?

so you can have it facing towards the FPR - you can watch it while adjusting the screw, otherwise you'd have to move towards the passenger side to see the pressure

This is pretty ugly: http://blog.hemmings.com/index.php/2009/05/11/hmx-checking-fuel-pressure/

yeah, same idea but i think my selection was a bit more classy :)

[Jeffy]

so you can have it facing towards the FPR - you can watch it while adjusting the screw, otherwise you'd have to move towards the passenger side to see the pressure
 
yeah, same idea but i think my selection was a bit more classy :)

I'll have to see what I can come up with but I think the gauge would be a nice addition and inexpensive.

[chrisfranklin]

Hopefully, I'll do one of the roads tomorrow and the other on the weekend.

Is there a gauge I can leave mounted to the schrader valve on the fuel rail?

I'm interested in the results on this

[sharpxmen]

I'm interested in the results on this

yes, you can get an -4AN female to 1/8'' NPT female adapter and one of the small pressure gauges (0-60 psi)

at a minimum something lilke this

4AN female to 1/8'' NPT adapter http://www.summitracing.com/parts/EAR-916104ERL/ - $7
1/8'' female to 1/8 female adapter http://www.summitracing.com/parts/FRA-491001/ - $3
0-60 psi fuel pressure gauge http://www.summitracing.com/parts/SUM-800160/ - $18
$28 in total

you might look for them locally as the shipping is something like $10

you might find a -4AN to 1/8'' npt female to female and that could cut the cost a bit and might also want to look for an elbow rather than the straight 1/8 to 1/8 female adapter: something similar to this http://www.summitracing.com/parts/FRA-491601/, but this one is $11 and seems overpriced to me (you can probably find it for $3 or so at a hardware store).

you can buy a brass elbow 1/8'' female to 1/8'' female at a h/w store for $2 (i saw one yesterday) - that would make it a grand total of $27

there's really no results, it just works and will show the fuel pressure in the rail. I have a permanent install with a teflon braided hose and the gauge in the dash