ashtons300zx

Is it just me or could there be a problem with the regulator. My fuel system setup is a Walbro 255lph intank fuel pump feeding a bosch 044 inline to a 1/2" fuel feed line, to -8 hose to the rail, -8 hose to the Weldon 2040 4-200psi regulator and then -6 return.

I connected the two ends of my -8 lines together to pressure test my fuel lines before the motor goes back in as i did the flaring on the 1/2" aluminum hardline myself and wanted to make sure as well as assembling all the hoses.

Problem is this.

according the the brand new liquid filled 0-100psi guauge with both pumps running im only getting 22 psi of steady pressure. It doesnt change when i adjust the reguator down or anything. I checked the voltage on the pumps and they are running with 11.2 volts again this is with the car off. I can hear fuel moving through the lines steadily but again just not building up pressure. I was gonna set my 65psi base pressure as well and no luck

Question is, is there an in and out to regulator. Not the return but does it matter what side you have the feed line coming into the regulator on. I have one of the -8 ports capped and then the -8 line on the other and the -6 return on the bottom.

Something is not seeming right.

Here is an older pic before the gauge was put on. But the setup is the same and dont mind the fitting not being tightened all the way down. Those are all fixed and tightend properly now.





I figure with this type of regulator it doesnt matter what side you come in on but maybe im wrong.

locash

Which port did you put the gauge on? That upper port with the orange fitting on it is for the vacuum/boost reference..

ashtons300zx

lol, Im doing a 700whp Sentra here, i think i know where the gauge goes. haha. That would be epic though. I have it where the green hex plug is. Which is the proper port. Its just a weird thing. If i pinch the return line at the tank it definetly causes the pumps to bog down as its audibly noticable.

Again i dont think it should matter what side port i use and i dont recall the paper with the regulator saying anything either, It just showed two ways to setup. Cap the fuel rail and run the feeds straight through and return out the bottom or the way i have it. Ill have to look and make sure it doesnt specify an in port.

Im sure ill figure it out. I dont think its the low voltage at the pumps causing the issue as again if so it wouldnt change tone when restricting the return line obviously signifying a higher pressure. Weird though, I purchased the regulator brand new as well.

BTW joe, i know you only mess with mostly hondas but if you want to mess with some variety, ill be heading to phoenix once im done getting the stuff in here in couple weeks to do dyno tuning. Im gonna street tune it at low boost just to get the a/f in a good spot where i want it and then take it for dyno tuning. I was gonna go to UMS where i went before but if you want I know you have a lot more experience with high hp cars, maybe you would want to give me a hand fine tuning this thing at full boost. Im running an aem ems series 1. I was making 550whp on a budget setup before with just a chipped ecu that i fine tuned and simple fuel system and 60 trim.

PM me if your interested in some variety. haha

locash

I've found that it is a lot easier to diagnose problems if you assume that everyone is an idiot. With that said, I would have assumed you were doing a 200hp Sentra. I would say to put the battery charger on 40+ amps and see if that changes anything, as the battery is obviously pretty weak to not be able to output 12+ volts.. Drop me a line when you get closer to tuning and we can discuss the tuning aspect..

ashtons300zx

lol, good one. eh, if 200hp will get you a 7.1@108 1/8th w/ 1.91 60 then hell yeah. haha

Nah we have all motor ve's making 270+whp. The fwd SR20's are attempting a comeback lol.

Made some big changes since the last setup. T67 h.o. .82 turbine, bigger fuel system, standalone, 6 speed trans from an 04 specV to finally get rid of the weak *** 5 speed. piping and coupler changes as I kinda half assed it last setup and kept blowing couplers hence the 1/8th mile time. But hey for what my last setup was, it definitely worked well.

Yeah with the both pumps running the voltage is at 11.1 i know weak. Ill give it a shot tomorrow and update when i get it figured out.

Ill definitely hit you up if your truly interested in seeing something a little different. Again i should have the tune pretty close as im decently familiar with the AEM unit and have tuned a couple other standalones so ill be hitting you up for sure.

ninesecrx

You should see if you can borrow someones fpr and plumb it in the system and see if you are having the same issues. That way you can see if theres a issue with the Weldon. You can use either side as a inlet, does not make a difference. If you still have the issue it would be the battery/pumps

ashtons300zx

im sure i will get it figured out tomorrow. I ran out of time today before work. Just thought it was strange. It could be something as simple as the battery voltage.

ashtons300zx

Problem solved:

These Weldon regulators have a lot of useless room on the adjusting screw thats for sure.

After putting a charger on the battery and seeing no change i figured what the hell and ill tightend the adjuster all the way down. I had adjusted it to just above the top of the nut before but this time as soon as i went down into the nut (below the top) it kicked in instantly and jumped to 80psi, Very very slight movements make a big change on the pressure.

I knew it had to be a regulator thing because as i would pinch closed the return hose to the tank pressure would rise to 45-50psi easily. So i knew something was up.

Thanks for the suggestions. I pressurized all my lines to 100psi and all is good, no leaks. Im happy then set my base pressure to 65psi.

0xenocron

I was going to say, the adjustment screw in your picture is backed out ALL of the way...glad you figured it out and posted up for others.