I just tested the system pressure of my TR and I wonder: the right side has about 6.7 bar, the left side 6,5 bar. this difference I don´t care much, but even this high pressure I care. in the mechanic manual I have only the description from the K-jetronic, not form the KE. and for this K the system pressure is only 5.0 to 5.6 bar. so at the KE could it be that the pressure is about 1 bar more? when I checked for leaks the pressure both sides after about 30 minutes are nearly 2.7 to 2.8 bar. what I also wonder is: when I let the left fuel pump run the pressure of those 6.5 bar is there within not even 2 seconds. the right side takes about 10 seconds from the holding pressure of 2.7 bar to the 6.7 bar. also when I stop the fuel pumps the left side is just down to those 2.7 bar, the right side takes about 10 to 15 seconds. does anyone knows what this could be? or does anyone has a manual for those KE-jetronic in this TR? or a link where I could read? the voltage ( plus and minus ) at the pumps are ok. the fuel pump delivery left side is about 990 cm³, right side about 1010 cm³ in 30 seconds
Those system pressures seem too high -- the F113B KE spec is 5.4 +/- 0.15 bar. And your delivery test results seem to be at the very minimum spec (which would correspond with the system pressure really being that high). Do you have access to another pressure gauge to recheck? Have your fuel pressure regulators been replaced recently? The KE3 system used on 328 does operate at a higher system pressure (6.3 +/- 0.2 bar) -- any chance that you got the wrong pressure regulators? One other thing easy thing that you should check is that the return lines going from the pressure regulators back to the fuel tank are not kinked and are in good condition. The KE publication for the F113B euro version is 95990856. Unfortunately, I don't have it in an electronic form, but Maranello Concessionaires (www.ferrariparts.co.uk) shows they have it for ~$40 US.
thanks for this fast answer steve I have 2 gauges here to check. one is going to 6 bar, the other to 10 bar. so as the 6 bar has been not enaugh ( it shows like about 6,5 bar ) I took the other gauge. but this also shows the 6.5 and 6.7 bar. so I must say that the gauges are ok. the right fuel regulator is a used one because the old one never opened and I got a pressure from more than 10 bar until you hear that the pump has problems. so I put in a used one with the same bosch part number: 0438161013. those are also inside the mercedes 126, 5.6 ltr this TR I have is the tr koenig competition with up to 1000 hp. I alreday opened an other thread about this car. so may be that koenig put in this fuel regulator to get more fuel when the turbo are working? I asked koenig already but he told me that they put in fuel regulator from bosch with the part number 0000781189. may be an other changed them? or koenig not remember right? so does anybody knows the opening pressure from those 2 regulators? I can not find anything. and still again the question of the original pressure of this KE-jetronic. the return fuel lines are new and not bended or so and I still wonder about the slow raising of the fuel pressure right side and also the long time until the pressure is down again when the pump is shut off. makes no sense to me. the next days I will change the "fuel accumulator" ( I hope that is the right word??? ) from the right to the left side and otherwise to see what will happen. because of soooo long time not running ( 5 years ) I had the problem that both fuel pumps have been not running anymore. only because of several times connecting the plus wire to the pump itself directly from a separate battery and also switching from the minus to the plus terminal ( so the pump would go reverse ) both pumps where running again after about each 20 minutes testing so. the fuel delivery of the pumps I tested directly at the pump exit. next days I will test this in the outlet line after the pressure regulator to see what will happen.
AFAIK, that is not the stock TR KE fuel pressure regulator -- which I have as F PN 125136 = Bosch 0438161001. (and that the late '80s MB 300SEL is a model that share many of the same Bosch components as KE TR). Interestingly, I also have that that Mercedes model (560) is the one that uses Bosch components similar to the 328 KE3-Jetronic and does have the higher system pressure. You could also try swapping the fuel pressure regulators too.
Did you mis-type this part number? RockAuto shows that Bosch 0438161013 regulator as looking like this: Image Unavailable, Please Login whereas, they show the 0000781189 regulator as looking like this: Image Unavailable, Please Login which is much more like the stock TR KE pressure regulator and is spec'd as 93psi/6.4 bar
hello steve, I didn´t misstype the parts number. this fuel regulator I send now the picture has the same number ( 0438161013 ), but on the picture not right to see. sorry please. also you may look http://www.koenig-specials.com/homepage%20neu/navigation%20neu%20englisch.htm for the regulator koenig sells for the mercedes for a very low price just now and he told me the same they have used in the TR. but today I found the mistake of the long taking until the fuel pressure right side is ok: so simple ! ! ! - only less fuel - the car in my garage is standing a little higher on the left side than on the right and the fuel in the tanks is going to the right. so the pump from the left what is for the cylinder right side also sucks air and not only fuel, so it takes so much longer until the pressure has been at the 6,7 bar. and after filling 40 more liters of fuel into the tanks suddenly the pressure both sides are rising equal. also both pumps are delivering now nearly 2 liter in 30 seconds ( meassured in the return line). hopefully this weekend the engine will run again after a long sleep. but the car is still not drivable because I´m waiting for the new gears for the primary gearbox ( from the crankshaft to the gearbox input ) but still looking for the pressure of the regulators with the numbers 0438161013 and 0000781189 Image Unavailable, Please Login
www.rockauto.com indicates that the equivalent for 0000781189 regulator is 93 psi/6.4 bar -- just do a part number search on that part number.
this number rockauto is offering is definitely not the bosch number because the fuel pressure regulator looks totally different and will never match.
I don't follow you -- the 0000781189 looks identical in form to the old one you posted: Image Unavailable, Please Login
I mean not the number 0000781189, that is like my regulator also looks like. I mean the number 0438161013 - this what rockauto shows under this number is definately not the right regulator or the number is wrong? and the old one I posted has exact the number 0438161013
