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Topic: Fuel Pressure Regulator (Read 791 times) previous topic - next topic

Fuel Pressure Regulator

I think my FPR (original one w/190xxx miles) is going out.  I just ordered these:

BBK-1617 Fuel Pressure Gauge
BBK-1706 Billet FPR 35-70 psi

From what I've read, a stock 5.0 HO should be around 38-39 psi at idle...can anyone confirm this?  I put in a new BBK fuel pump (190lph??) when I did the HO swap and changed the fuel filter last spring.
'88 'bird, 10.9:1 306 w/TFS top end, forged rods/pistons, T-5 swap & bunch of other stuff, 1-family owned, had it since ‘98, 5.0tbrd88 on Instagram and YouTube

Fuel Pressure Regulator

Reply #1 –
39 vac unhooked
88 Turbocoupe: Coast High Performance 331 kit 28oz balance, Comp XE264HR14 cam, 58cc 185 afr heads, 1.7 roller rockers, Mass-Flo EFI (was POS to setup and their techline is a joke at best)
Full 1 5/8 primary equal length headers, 2 1/2 exhaust, Full manual reverse VB c4 and baked off clear coat "BECAUSE RACECAR"

Fuel Pressure Regulator

Reply #2 –
Thanks.
'88 'bird, 10.9:1 306 w/TFS top end, forged rods/pistons, T-5 swap & bunch of other stuff, 1-family owned, had it since ‘98, 5.0tbrd88 on Instagram and YouTube

Fuel Pressure Regulator

Reply #3 –
I got my fuel pressure regulator installed last night.  It took some redneck ingenuity to get the very back allen head bolt back in.  My allen wrench would not fit so I found the correct size 1/4" drive allen head bit, applied duct tape to the back of a 1/4" gear wrench brand end wrench (to keep the bit from falling out), and finally after about an hour got the bolt started.  I ended up getting a long flat head screw driver and prying upwards on the bolt while ratcheting the wrench to finally get it started in. 

After that I unhooked the vac line and set the pressure at 39psi.  I took the car for a drive and re-checked the pressure.  I noticed the pressure was now only around 30 psi!!  I finally figured out that the liquid in the BBK gauge I am using must have heated up and thrown off the reading!  Something to keep in mind if you guys are ever in the market for FP gauges.  I would stay away from the liquid filled ones as they are only accurate when underhood temps are cool.

On a side note my car seems to be experiencing a slight miss/hesitation under WOT or a load...the plugs/wires/cap/rotor are all only a couple of years old but sounds like I need to check them out.
'88 'bird, 10.9:1 306 w/TFS top end, forged rods/pistons, T-5 swap & bunch of other stuff, 1-family owned, had it since ‘98, 5.0tbrd88 on Instagram and YouTube
 

Fuel Pressure Regulator

Reply #4 –
I should have read this before (from Summit's website):

Quote
When reading fuel pressure, keep in mind that a fluid filled pressure gauge will change it’s reading as the temperature of the gauge case changes (Under hood temperature). As the liquid in the case heats or cools, it expands and contracts, causing case pressure to change as much as 1 psi for every 30 degrees temperature change of the gauge. Will directly screw into any 1/8 NPT female port. Includes adapter fittings to be used on Ford EFI Schrader valves.


Oh well, all you have to do is make sure and check the pressure when the engine is cold.  Really not a big deal I guess.
'88 'bird, 10.9:1 306 w/TFS top end, forged rods/pistons, T-5 swap & bunch of other stuff, 1-family owned, had it since ‘98, 5.0tbrd88 on Instagram and YouTube