Soonto_HAS_soop Posted February 25, 2007 Share Posted February 25, 2007 The FPG will be sitting on the FPR, which if you unscrewed will have changed the fuel pressure rating..... You may now have the pressure set too high, or infact to low. If it's too high you could be putting too much fuel into the engine, if it's too low, you may not be putting enough fuel in, and it will definitely not be giving you a good spray pattern. Quote Link to comment Share on other sites More sharing options...
Whitesupraboy2 Posted February 25, 2007 Share Posted February 25, 2007 Ipresume a mapped car would be mapped on the fuel pressure as well. So if it was at 50PSI and mapped the fuel going in to engine now will either be higher or lower? Quote Link to comment Share on other sites More sharing options...
sarjo Posted February 25, 2007 Author Share Posted February 25, 2007 The FPG will be sitting on the FPR, which if you unscrewed will have changed the fuel pressure rating..... You may now have the pressure set too high, or infact to low. If it's too high you could be putting too much fuel into the engine, if it's too low, you may not be putting enough fuel in, and it will definitely not be giving you a good spray pattern. Thanks soonto. Just had the same thought myself. Quote Link to comment Share on other sites More sharing options...
sarjo Posted February 25, 2007 Author Share Posted February 25, 2007 Ok, checked the plugs, a bit wet, dried them and cleaned them up and put them back in. The car fired a bit healthier but then went back to just turning over. I have noticed the fpg now will only reach 16psi and this only shows when the ignition is on, when it's turned off it goes back to 0. Is this right? I can't get it any higher than 16 although when I checked the fuel yesterday it was gushing. Going to check the spark now but any other ideas??? Quote Link to comment Share on other sites More sharing options...
Soonto_HAS_soop Posted February 25, 2007 Share Posted February 25, 2007 What FPR do you have? Maybe the FPR is crapped out and split inside? Quote Link to comment Share on other sites More sharing options...
sarjo Posted February 25, 2007 Author Share Posted February 25, 2007 What FPR do you have? Maybe the FPR is crapped out and split inside? Thats what I'm thinking now as we have spark. Think I'm going to have to get a new one just to eliminate. Quote Link to comment Share on other sites More sharing options...
Soonto_HAS_soop Posted February 25, 2007 Share Posted February 25, 2007 what type have you got? Quote Link to comment Share on other sites More sharing options...
sarjo Posted February 25, 2007 Author Share Posted February 25, 2007 what type have you got? Not sure what type it is. Is it safe to bypass the fpr just to try to start the car briefly to eliminate it? Any recommendations for a good fpr which wont break the bank balance? Quote Link to comment Share on other sites More sharing options...
TLicense Posted February 25, 2007 Share Posted February 25, 2007 Not sure what type it is. Is it safe to bypass the fpr just to try to start the car briefly to eliminate it? Any recommendations for a good fpr which wont break the bank balance? No, you can't bypass it. What does the FPR look like? Can you get a pic of it? On the diagnostic port, connect +B with FP with a piece of wire, and then see what the pressure gauge reads. It should read between 33 and 40psi. If it reads anything other than this, adjust it until it does. At least you know that the fuel pressure will be set to the correct value then. Have you got an aftermarket ECU or anything like that? Quote Link to comment Share on other sites More sharing options...
sarjo Posted February 25, 2007 Author Share Posted February 25, 2007 No, you can't bypass it. What does the FPR look like? Can you get a pic of it? On the diagnostic port, connect +B with FP with a piece of wire, and then see what the pressure gauge reads. It should read between 33 and 40psi. If it reads anything other than this, adjust it until it does. At least you know that the fuel pressure will be set to the correct value then. Have you got an aftermarket ECU or anything like that? I have an AEM ecu on her. Havent done any diagnostics before so wouldnt know where to start. I think it is a problem with the fpr as I've got loads of petrol coming in but hardly anything coming out. I've tried adjusting it but it is making very little difference reads between nothing and at most 16psi. Quote Link to comment Share on other sites More sharing options...
TLicense Posted February 25, 2007 Share Posted February 25, 2007 Ahh, you may be up shit creek then I'm afraid. Y'see before you start mapping a car, any car, you need to set the fuel pressure. Really it can be set to anything, but once it's set, it needs to stay set. If you adjust the fuel pressure, unless you can change it back to exactly (well +/- a couple of psi) what it was, then you'll be putting a different amount of fuel into the car than what it was mapped to, which means either running rich or lean. The main problem being only the person who mapped it to start with, is likely to know what fuel pressure they set it to, unless you can remember what it used to read on the dial??? As it doesn't really matter, to a certain degree what it's set to, as long as it doesn't change, they may not have set it to anything specific, if you see what I mean. Anyway, that's 2 steps down the road. The first problem you seem to be having is getting a decent amount of pressure to start with. This can be down to one of a few things. 1. No fuel. Sounds like you've got this though. 2. Dodgy fuel pump. (Although could be too low a voltage supply, making the pump flow only a small amount) 3. A kinked fuel line. 4. A blocked fuel filter. 5. A dodgy FPR. 6. A leak. (This would be pretty obvious though) I wouldn't automatically assume it's the FPR, as it's quite possible that it could be any of the others. The only way you can check it methodically is by going through it one by one eliminating them. One thing I would say though, is if your FPR is an FSE one, like this:- http://www.proven-products.co.uk/products/img_2d1.jpg I would be willing to put good money on it being this. Quote Link to comment Share on other sites More sharing options...
sarjo Posted February 25, 2007 Author Share Posted February 25, 2007 Ok Fuel pumps are good, both working and I dont think the fuel filter is blocked as there is one hell of an amount of fuel coming through to the engine (disconnected at the fpr to check). Cant smell or see any signs of a leak and having checked the fuel lines there doesnt seem to be any kinks. So, like you I'm guessing its the fpr. I am away from the car at the moment, but will take a pic and post it when I get back. Thanks for the inputs. Quote Link to comment Share on other sites More sharing options...
Soonto_HAS_soop Posted February 25, 2007 Share Posted February 25, 2007 I have seen small leaks in the small pipe between an uprated fuel pump and the hanger. It could be that, but it isn't the quickest or easiest thing to check. Quote Link to comment Share on other sites More sharing options...
sarjo Posted February 25, 2007 Author Share Posted February 25, 2007 Ok, I had an idea. I removed the pipe coming out of the regulator and petrol peed out, so am thinking I've ruled out a faulty regulator as petrol seems to be passing through it?? But then, why should my guage be reading only 16psi max? Can anyone explain in simple terms the pathway of fuel from the tank to ignition? I ask because the hose coming from the fuel rail has the flow and I'd have thought it would be the other one? Quote Link to comment Share on other sites More sharing options...
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