Fuel Pressure Issue: Advice needed please
#26
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Not sure how it is hooked up. All I know is that I had to get a particular sensor installed. Apparently there are some other guys on the forum who are also reading fuel pressure off the DashDAQ. Perhaps one of them can chime in with the details[/QUOTE]
+1 for info on that
+1 for info on that
#29
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#31
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2005 E55 AMG
I wonder if anyone else has these issues with aftermarket pumps? I am getting ready to install my aem 320lph pumps but if they cause an issue I will keep the stock ones and get rid of the factory fuel filter for an inline filter.
#36
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I think it might be an issue of the internal return line being too small, and the pumps providing way more fuel than the engine needs. A new stock pump/filter assembly will put out all the fuel you'll need unless you're running E85 or running a big wet nitrous kit without a standalone fuel system for the nitrous.
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2005 E55 AMG
I believe you may be right. The only way to alleviate that issue would be to make the system a return style with a regulator in the engine bay. Here is a rundown of what my setup will be. Hopefully get started installing all these parts this weekend.
180 lower/84 upper pulley
Belt wrap kit
82mm Throttle body
Aem meth injection
Killer chiller
3 gallon trunk tank
Kleeman headers
looped rail w/1000cc injectors (NO E85)
One step colder plugs
I use BIP for ECU tunes
Nitrous maybe? at most a 50-75 shot.
180 lower/84 upper pulley
Belt wrap kit
82mm Throttle body
Aem meth injection
Killer chiller
3 gallon trunk tank
Kleeman headers
looped rail w/1000cc injectors (NO E85)
One step colder plugs
I use BIP for ECU tunes
Nitrous maybe? at most a 50-75 shot.
#38
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Anthony, Your heated fuel rails are a common problem from pumping to much fuel and most the fuel will be heated up and dumped back into the fuel tank via return line. You may need to add a progressive voltage controller or some way to manage the large amount of fuel you are pumping.
Also, are you using a fuel manifold set up in front of the pumps, so that your pumps have good supply under wot? Lot of times, big pumps can suck a fuel line dry at WOT and cavitate, if a fuel manifold is not present.
It is very hard for to compare your set up to others that may be near sea level , even if you have purchased the same bolts ons, as you are at 6000 ft above sea level. That is like being in outer space to us sea level guys
Also, are you using a fuel manifold set up in front of the pumps, so that your pumps have good supply under wot? Lot of times, big pumps can suck a fuel line dry at WOT and cavitate, if a fuel manifold is not present.
It is very hard for to compare your set up to others that may be near sea level , even if you have purchased the same bolts ons, as you are at 6000 ft above sea level. That is like being in outer space to us sea level guys
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E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
www.ultimatepd.com
instagram @ultimate_pd
facebook.com/ultimatepd
#39
Senior Member
Thread Starter
I think it might be an issue of the internal return line being too small, and the pumps providing way more fuel than the engine needs. A new stock pump/filter assembly will put out all the fuel you'll need unless you're running E85 or running a big wet nitrous kit without a standalone fuel system for the nitrous.
Anthony, Your heated fuel rails are a common problem from pumping to much fuel and most the fuel will be heated up and dumped back into the fuel tank via return line. You may need to add a progressive voltage controller or some way to manage the large amount of fuel you are pumping.
Also, are you using a fuel manifold set up in front of the pumps, so that your pumps have good supply under wot? Lot of times, big pumps can suck a fuel line dry at WOT and cavitate, if a fuel manifold is not present.
It is very hard for to compare your set up to others that may be near sea level , even if you have purchased the same bolts ons, as you are at 6000 ft above sea level. That is like being in outer space to us sea level guys
Also, are you using a fuel manifold set up in front of the pumps, so that your pumps have good supply under wot? Lot of times, big pumps can suck a fuel line dry at WOT and cavitate, if a fuel manifold is not present.
It is very hard for to compare your set up to others that may be near sea level , even if you have purchased the same bolts ons, as you are at 6000 ft above sea level. That is like being in outer space to us sea level guys
#40
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2005 E55 AMG
Chris, this theory fits best with the symptoms I was experiencing on the AEM pumps. Your suspicion that clothing the fuel line with heat wrap would probably exacerbate the issue proved correct - that does seem to indicate that the fuel was heating up unduly in the tank itself. Anyway, I'll do some proper testing on the stock pumps over the weekend. Thanks for all your advice along the way.
Thanks Brooke. 5,500 feet above sea level is undesirable for so many reasons If I decide I need to go back to the AEM pumps, I'll explore both of your suggestions. I may be misunderstanding you but I do not have a return line from the fuel rails back to the tank. There is, however, a return line that feeds excess fuel from the left side of the tank to the right side (which houses the pumps). I'm wondering though whether Chris is not correct in his view that the stock pumps are adequate. If my fuel pressure and AFRs are constantly at a level that poses no danger, need I look at stronger pumps at all?
Thanks Brooke. 5,500 feet above sea level is undesirable for so many reasons If I decide I need to go back to the AEM pumps, I'll explore both of your suggestions. I may be misunderstanding you but I do not have a return line from the fuel rails back to the tank. There is, however, a return line that feeds excess fuel from the left side of the tank to the right side (which houses the pumps). I'm wondering though whether Chris is not correct in his view that the stock pumps are adequate. If my fuel pressure and AFRs are constantly at a level that poses no danger, need I look at stronger pumps at all?
#42
Senior Member
Thread Starter
All good so far on the stock fuel pumps, thanks. Not even the slightest hint of a problem. Did about 90 minutes of driving in 30 deg Celsius weather last weekend and fuel pressure held up just fine
#43
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#44
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#46
How much fuel pressure?
how much fuel pressure?
I believe you may be right. The only way to alleviate that issue would be to make the system a return style with a regulator in the engine bay. Here is a rundown of what my setup will be. Hopefully get started installing all these parts this weekend.
180 lower/84 upper pulley
Belt wrap kit
82mm Throttle body
Aem meth injection
Killer chiller
3 gallon trunk tank
Kleeman headers
looped rail w/1000cc injectors (NO E85)
One step colder plugs
I use BIP for ECU tunes
Nitrous maybe? at most a 50-75 shot.
180 lower/84 upper pulley
Belt wrap kit
82mm Throttle body
Aem meth injection
Killer chiller
3 gallon trunk tank
Kleeman headers
looped rail w/1000cc injectors (NO E85)
One step colder plugs
I use BIP for ECU tunes
Nitrous maybe? at most a 50-75 shot.