Edd-XS 0 Posted March 20, 2006 right im writing this on behalf of a friend of mine. Basically he has just spent the weekend swapping a 1.9 lump over into his Gti. He drove the donor 1.9 to his workshop no problems, swapped the lot over but it doesnt seem to want to run properly. On closer inspection he says that hes got far too much fuel pressure, but hes not sure what could be causing it? Hes swapped over the fuel pump, relay and loads of other bits and its still saturating the injectors. Has anyone got any ideas what could be causing this? Im just forwarding the message as he doesnt have the net! Thanks alot Edd Share this post Link to post Share on other sites
hengti 2 Posted March 20, 2006 presume it's not fitted with a FSE - ? 1 Share this post Link to post Share on other sites
Edd-XS 0 Posted March 20, 2006 presume it's not fitted with a FSE - ? correct! just a standard fuel pump... Edd Share this post Link to post Share on other sites
hengti 2 Posted March 20, 2006 pls excuse me if this sounds at all condescending - no idea of your experience the fuel pump is completely unrelated to a FSE - which is a replacement for the fuel pressure regulator (on the end of the fuel rail) FSEs are adjustable - if it's got one fitted, it could account for the pressure problem just a thought anyway Share this post Link to post Share on other sites
Edd-XS 0 Posted March 20, 2006 sorry my bad! I thought the FSE was almost like a second fuel pump... all i know is apparentely they're abit of a waste of time! But no i know he doesnt have one fitted. Edd Share this post Link to post Share on other sites
Anthony 1,003 Posted March 20, 2006 If he is genuinely getting excessive fuel pressure, then the problem has to be either with the fuel pressure regulator (on the end of the fuel rail), vacuum feed for the FPR (lowers fuel pressure on low throttle openings), or a restrictive fuel return pipe. However, problems with high fuel pressure are pretty damned rare, and problem is much more likely down to overfuelling due to management related issues (bad ECU temp sensor is the usual one, and if he's done an engine swap a ECU/AFM/injector mismatch of 1.6 and 1.9 parts is another) Share this post Link to post Share on other sites
Richie-Van-GTi 71 2 Cars Posted March 20, 2006 Not sure how the wiring works but could he of got a wire wrong somewhere that goes to the fuel pump relay so its permanently on rather than pulsing according to engine speed and throttle position? Share this post Link to post Share on other sites
Anthony 1,003 Posted March 20, 2006 Not sure how the wiring works but could he of got a wire wrong somewhere that goes to the fuel pump relay so its permanently on rather than pulsing according to engine speed and throttle position? Fuel pump runs all the time. Fuel that isn't required is simply returned to the fuel tank via the fuel return line. Share this post Link to post Share on other sites
Richie-Van-GTi 71 2 Cars Posted March 20, 2006 really, I thought the TPS switch was to shuit the fueling off or is it the injector opening times that are effected? Sorry to thread snatch but its good to ge all this info in my own head Share this post Link to post Share on other sites
jackherer 543 Posted March 20, 2006 If he is genuinely getting excessive fuel pressure, then the problem has to be either with the fuel pressure regulator (on the end of the fuel rail), vacuum feed for the FPR (lowers fuel pressure on low throttle openings), or a restrictive fuel return pipe. However, problems with high fuel pressure are pretty damned rare, and problem is much more likely down to overfuelling due to management related issues (bad ECU temp sensor is the usual one, and if he's done an engine swap a ECU/AFM/injector mismatch of 1.6 and 1.9 parts is another) I agree, unless hes used a pressure gauge to measure at the rail theres no way he could know, its going to be one of the things Anthony mentions. really, I thought the TPS switch was to shuit the fueling off or is it the injector opening times that are effected?Sorry to thread snatch but its good to ge all this info in my own head yeah the TPS sends a signal (on or off) to the ECU which then cuts the injectors. The pump runs constantly as long as the engine is turning over, its controlled by the tachometric relay (the tacho part means rotation/revs like the rev counter...). Share this post Link to post Share on other sites
maxi 36 1 Cars Posted March 21, 2006 Whoever your mate is Edd, Im not to happy about my phone number being given out and him just ringing me randomly while im busy at work asking stupid ass questions. The car is overfueling since he has done the swap. I think you will find it has sweet FA to do with excess fuel pressure and he is pissing in the wind anyway without a pressure gauge. Maxi Share this post Link to post Share on other sites
