044 inline pump: when should I turn it on?

[definitiveno]

My mechanic said he tried turning it on at 10 psi but had some small issues with it so then reset it to turn on at 4 psi. In his hands it worked well but since I've been doing long road trips and using cruise control at 85 mph I'm finding the car stumbling when the pump turns on and off. Right when it turns on it goes to 22:1 afr for a half second and then jumps back to normal........ And wil occasionally do some thing similar when it turns off. In either case the motor fumbles and loses power for that half second and creates a jerky ride. If I had to say what it feels like is it feels like a brief fuel cut. Those that have used this pump inline any help with how you got it to work smoothly with ecmlink would be very much appreciated.....

 

[RvlutionMtrsprt]

The pump shouldn't be activated at any certain rpm or boost. It should just be wired/plumbed to work all the time. Activating the pump like it were a meth injection system seems odd to me.

 

[definitiveno]

The pump shouldn't be activated at any certain rpm or boost. It should just be wired/plumbed to work all the time. Activating the pump like it were a meth injection system seems odd to me.

I have 2150 injectors and if my memory serves me correctly ( and my memory very rarely does) I think there was an issue with the 255 intank and the 044 inline overrunning the fpr and running too rich at idle and/or an issue with not enough voltage, but I will have to verify with the mechanic cause it's possible I don't know what I'm talking about.

Have you run the 044 inline full time without issue?

 

[GRAVEDIGGER]

You should be able to get both pumps to work together and stay on all the time as far as I know. If you are overrunning your fpr maybe it's time to get a new one. What kind of fpr do you have now? I would think if you were running a quality one like Aeromotive or Fuelab you wouldn't have a problem with overrun. Maybe it's time to get one of those if you don't already have one. Good luck

 

[99gst_racer]

I agree with these guys. The 255 pump and the 044 pump should be wired together to the same relay. There's just no reason to have them activate at separate times. As long as you have the proper fuel pressure regulator, you won't have any issues.

 

[UofACATS]

I ran an evoIX in-tank and 044 external off the same fuel pump rewire line, and was able to achieve 43.5 base fuel pressure with a Fuelab AFPR.

 

[definitiveno]

You guys think voltage would be okay? The car lives in Reno where there will be times every accessory on the car (windshield wipers, rear wiper, rear window defogger, heater fan, headlights, radio, dual high output radiator fans) will all be on at idle. I'm not sure what fpr I have now, the car was stripped (robbed) at a shop and I took it to another shop for rebuild (rre) and I don't know what they used.

 

[99gst_racer]

As long as your charging system is up to par, you won't have any voltage issues. Many people here are sucessfully running fuel pumps in series with crappy factory alternators.

 

[definitiveno]

The car has a factory fpr. If I install a fuelab/aeromotive will I need to do any thing else? Any modifications to the return?

 

[Absit]

You're running dual pumps and the stock FPR? Found your problem..

 

[UofACATS]

The car has a factory fpr. If I install a fuelab/aeromotive will I need to do any thing else? Any modifications to the return?

I have a stock return on the car with dual pumps with no problem setting correct base fuel pressure. My Fuelab AFPR has a barbed fitting on the bottom, and attaches to the oem return line hose.

 

[definitiveno]

I have a stock return on the car with dual pumps with no problem setting correct base fuel pressure. My Fuelab AFPR has a barbed fitting on the bottom, and attaches to the oem return line hose.

U did not drill out the return siphon?

You're running dual pumps and the stock FPR? Found your problem..

My mechanic had different luck running an inline walbro configured the way mine is however the Bosch behaves differently once it turns off.

 

[knochgoon24]

It may be time for you to spring for the AFPR. You've probably spent more money on having your mechanic fiddle with the second pump relay as you would have on an AFPR.

 

[Absit]

U did not drill out the return siphon?



My mechanic had different luck running an inline walbro configured the way mine is however the Bosch behaves differently once it turns off.

Your mechanic sucks, he's trying to make it WAY too complicated. Check the forums, it's almost universal - you need a FPR if you're running larger than a 190lph pump. Then leave both on the same relay.

 

[definitiveno]

I'm getting the fpr, we have established that. You guys are confused about my mechanic though. You guys shouldn't speak so matter of fact when u don't know all the details. He's been a member here for years, well known to be a good guy and has run his own car the way described for some time without issue. He just uses a walbro which behaves differently when turned off. We discovered some thing new about 044, it doesn't like this config. Change the fpr and all is well.

 

[DSMDirkah]

Well, even though you fixed the problem, I would have guessed that your injector battery offset might needed to be tweaked to accommodate for the voltage drop when the pump comes on line. Oh and the whole "you need AFPR for a walboro 255!" is an urban legend. I have personally checked this and verified that it is false. If the factory FPR is out of standard than yes, it will be over run. I usually try the pump first and see what happens.

 

[99gst_racer]

With an AFPR, you'll be fine with the stock return line. It might help to drill out the siphon a bit too.

 

[UofACATS]

U did not drill out the return siphon?

You know I'd completely forgotten I'd done that, yes. Thanks for reminding me.

I can't say whether it solved anything, I did that mod at the same time I added the external. It "worked" so I never thought twice about it, but IMO don't do it until you need to because it helps pull fuel from both sides of the AWD tank.