How to install a Bosch 044 fuel pump in tank or intank
03-23-2011, 10:24 PM
#21
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I have an 044 in a non-Miata. It is ridiculously loud if it is pumping into a restriction like a kinked fuel line (or, perhaps, a restriction like stock fuel lines designed for a 120 HP engine). The check valve can also be a source of noise. My 044 (again, in a not-miata) got noticeably quieter when I ran new -6 AN hard line. The other problem I had (may not be an issue on the Miata) is backpressure on the fuel pressure regulator (engine-mounted) -- to get good 4 bar fuel pressure at 26 PSI I had to run it at 4.5 bar at idle, because the return line backpressure at high bypass (idle) artificially increased the pressure.
Also, that junk in your fuel tank isn't normal. I've looked into a few pristine 200,000+ mile gas tanks.
Also, that junk in your fuel tank isn't normal. I've looked into a few pristine 200,000+ mile gas tanks.
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03-24-2011, 03:08 AM
#23
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One thing you guys that use the sock filter with that blue anodized adapter need to look at is the relative position of the filter media of the sock to the inlet on the adapter. The neck of the adapter is long enough that it seats all the way at the bottom of the sock. Meaning that when the sock is slid all the way on to the adapter, the only possible way for fuel to enter the adapter is through the area of sock which is pressed tight against the base of the adapter. You go from something like 10-12 sq/in of filter media to less than 1 sq/in. The solution is cut down some of the neck of the adapter to shorten it and get the opening up off the bottom of the sock. Pictures below.
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03-24-2011, 08:43 AM
#24
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I have an 044 in a non-Miata. It is ridiculously loud if it is pumping into a restriction like a kinked fuel line (or, perhaps, a restriction like stock fuel lines designed for a 120 HP engine). The check valve can also be a source of noise. My 044 (again, in a not-miata) got noticeably quieter when I ran new -6 AN hard line. The other problem I had (may not be an issue on the Miata) is backpressure on the fuel pressure regulator (engine-mounted) -- to get good 4 bar fuel pressure at 26 PSI I had to run it at 4.5 bar at idle, because the return line backpressure at high bypass (idle) artificially increased the pressure.
I am not convinced that the stock hard line cannot flow enough fuel. The stock fuel line is essentially a -5 line (5/16"). A -6 line is 3/8". The -6 is only 18% larger than a -5.
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03-24-2011, 11:39 AM
#29
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logged voltage indicates all is okish with voltage. i will see if it is quieter when tank is full.
No, the way I mounted it up, it only sits about a half inch lower than the stock pump.
No, the way I mounted it up, it only sits about a half inch lower than the stock pump.
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03-24-2011, 09:43 PM
#31
Stolen from Paul Bird's twin-turbo carbon fiber bodied AIX Mustang build log, this is how you install a fuel pump. They are all Walbro 255 pumps.
Corner Carvers fuell plumbing tech
And another photo I had of the assembly:
Corner Carvers fuell plumbing tech
Speaking of difficult solutions, this is my redneck version of an F1 type fuel system with a lift pump and swirl tank. This is, in my opinion, about as starvation resistant as you can get. And while heavy, it does allow me a margin on fuel use that I would not take with a convential setup. I can probably get away with running 3 gallons (apx. 18 lbs) less fuel than otherwise.
Twin Walbro 255 high pressure pumps with ATL pickups:
Pumps mounted in swirl tank:
This is the entire assembly which I fabricated from my Fuel Safe mounting plate.
BTW, the lift pump (another Walbro 255 operating at near 0 psi) is connected to one of these that resides in the back center of the cell:
Here is what it looks like from the outside. Nice and Clean with a hermetically sealed mil-spec connector handling the wiring:
Twin Walbro 255 high pressure pumps with ATL pickups:
Pumps mounted in swirl tank:
This is the entire assembly which I fabricated from my Fuel Safe mounting plate.
BTW, the lift pump (another Walbro 255 operating at near 0 psi) is connected to one of these that resides in the back center of the cell:
Here is what it looks like from the outside. Nice and Clean with a hermetically sealed mil-spec connector handling the wiring:
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07-23-2012, 11:47 AM
#36
We run twin Bosch 044s outside of the fuel cell in our Grand AM cars. Our set-up is flowing enough fuel for about 6000hp, which we are using about .000033% of that capability. We run both pumps all the time (we've had motors blow up because of fuel delivery issues before) and it is LOUD AS H E double hockey sticks.
It's okay though because race car. And once you actually fire the engine you no longer can hear the fuel pumps anyway.
Morale of the story is 044 is stupid loud for a street car.
It's okay though because race car. And once you actually fire the engine you no longer can hear the fuel pumps anyway.
Morale of the story is 044 is stupid loud for a street car.
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03-26-2015, 08:34 PM
#38
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I have one of these pumps on my Miata in have a wally 255 in tank feeding an 044 and it is stupid loud but mine is Mount d basically to the top.of the tank I have zero fuel delivery problems with one pump so they work great but they are loud so just remember that when you mount it.
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06-18-2017, 08:33 PM
#39
Digging this back up like an episode of The walking dead when I was searching for a picture of a fuel sock installed correctly. A couple of things jumped out at me in this write up that should probably be corrected.
First the fuel sock installed by OP will result in the sock sticking up off the bottom at a 45 deg angle. After I got the assembly out of the tank it was obvious why the factory sock is angled. There is a sump in the front of the tank and the lines are angles to place the pump inlet in this sump. Turn the assembly upside down and hold the flange level and it'll be obvious why the sock needs to be angled.
Secondly, I can't imagine how much the fuel pressure rocks up with factory FPR. I installed a pressure sensor and with a walbro 255 I was seeing 10 to 12 psi increase at idle over the factory NB set point of 60psi. The 044 should be nuts and that's probably why it's so loud. In my opinion an 044 needs upgraded FPR and a larger line.
First the fuel sock installed by OP will result in the sock sticking up off the bottom at a 45 deg angle. After I got the assembly out of the tank it was obvious why the factory sock is angled. There is a sump in the front of the tank and the lines are angles to place the pump inlet in this sump. Turn the assembly upside down and hold the flange level and it'll be obvious why the sock needs to be angled.
Secondly, I can't imagine how much the fuel pressure rocks up with factory FPR. I installed a pressure sensor and with a walbro 255 I was seeing 10 to 12 psi increase at idle over the factory NB set point of 60psi. The 044 should be nuts and that's probably why it's so loud. In my opinion an 044 needs upgraded FPR and a larger line.
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