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A while back (read way past return period) I bought a couple fuel pumps that were listed on RA's wholesale discount promo. They were quite inexpensive, and I needed to replace my Mallory (long weird story about killing it pumping home heating oil) anyways, I'm going back to a Nikki and want the oem consistent 3 psi. Engine is 12a mild street port. It made 141 rwhp with a holley 465. I want to work with a stock Nikki (s3) to get my ground up build running and look at modding the Nikki after it's running. That brings me to this, what was described as a stock fuel pump. Any ideas on what this thing is?
Looking at this, it looks like an in tank pump, I would have sworn all sa/fb pumps were external. I have a hangar assembly from an fc that i was thinking of using, but I don't know what this thing is and if it would provide the 3 psi consistently needed. If someone has a good oem pump that they have laying around please let me know. I have a feeling this is not the correct pump at all. My buddy told me this doesn't look like any fc pump he's ever seen either.
While on the subject of 3 psi, I did find this gauge that is a good 0-5psi range for these low pressures. I'm actually not sure how the return line and stock fuel pressure regulator works, I've only ever had the after market fpr for the Holley 7psi, more to learn. I was planning on using one of those but have heard that the oem would provide more consistent pressure/flow.
There is no OEM fuel pressure regulator to deal with. Just a pump and some lines. There is a restrictor needed in the return line off the nikki thats placed just in the hose right at where it connects to the nikki. You can use a large fuel jet as a substitute if you don't have the OEM return line restrictor. Not sure what size is needed on that jet.
The FE0285 pump shown is an in-tank pump. It requires a bracket and as shown has a filter sock that attaches to the input. What you need is a pump that is external such as shown Dummy Fixer post. Fooling with 1st gens for over 30 years, I am not aware of any stock factory model using an in-tank pump setup. I would say "show FE0285 fitting 83-95 Mitsubishi and Chrysler minivans, and the 84-85 Rx7 ," is not correct showing the RX7 application. There is also another sure way to assure you get your required pressure, place a quality fuel pressure regulator in line. Just a thought, your mileage may vary.. Good luck
Thanks, I'll check with walbro to see if it's a misprint. Think it might be the gsl-se pump? Anyone know what pressure the gsl-se efi ran?
I was planning on running the mallory through a summit fpr on the feed line with the gauge shown. Either running the return line from the fpr or through the Nikki. Not sure which way would be happier. Either way, the mallory is dead (diesel will do that). I kind of like the idea of running an in tank pump, having the hangar in there would make it easier to go efi in the future.
With all the hassle of trying to make an in-tank pump work, I would seriously look at just getting a different pump. I and some others have had good success with the Carter P4070 as a stock replacement/upgrade. It's not a direct fit, and depending on how you mount the thing it can be a little noisy, but for the price I'm definitely a fan. It does however require a fuel pressure regulator. If the fpr from the Mallory setup is still good, you can likely just get a new spring to accommodate the lower pressure for the Nikki (I know at least Holley sells spring kits for their regulators).
While 90 degree fittings probably hurt flow a little, it makes it far easier to fit and it's still plenty for the Nikki. This is how I have my pump installed:
That's very similar to how I had previous holley blues (two of them) and the mallory mounted. One of the other benefits of running an in tank pump would be the sound isolation. For both brands, on floating rubber mounts, the fuel pump was louder than the exhaust
I should probably preface this with that idea that i have a bp engine and miata trans that was already wired and running in an fb. Just need an fc subframe or magical welding to clear the structural oil pan around steering linkage with the stock subframe. I have the hangar assembly from an s5 that needs to be shortened a little, but otherwise all there, including the little tiny screws and flange. That is eventually going in the 84 (i think) my 83 is going to keep the 12a and Nikki
i did some testing a few years ago, some pressure testing and some volume testing, i would encourage you to do it, its easy all you need is a liter bottle with volume markings (mine is supposed to be for juice) and a stopwatch
i found, that the stock pump delivered a rock steady 2.75psi of pressure and plenty of flow (it was ~1400cc/min).
the holley regulator drops flow to like 1200cc/min, which is not enough, AND pressure is all over the place.
for sure those 90 degree fittings are hurting flow, i tested the carter in my car, and its rated at 72gph, but its delivering about 36....
10-15-20, 07:24 PM
