| Author | Message | ||
| Greg Rodgers (Joechristmas)
Junior Member Username: Joechristmas Post Number: 158 Registered: 3-2001 |
New info on mine. CTK has given me some great advice. I got the car hot to where it wouldn't start and then turned the key to position II. I then pushed down slightly on the sensor plate and heard the fuel pump BUZZ. I did this a few times. Then I went in and started the car and it fired right up. What does this mean? What part of the system would cause this? | ||
| Greg Rodgers (Joechristmas)
Junior Member Username: Joechristmas Post Number: 157 Registered: 3-2001 |
I have been working on a similar issue. I am thinking it could be in the fuel distributor. The odd thing is that many of these QVs have had the same problems but many solutions. I am wondering if it may stem from one larger item such as the FD. I have tried many items and I can't figure it out. I just can't get gas past the FD to the injectors but I will have pressure up to the FD but it won't push the fuel that is in the fuel line through the injectors. Strange huh? | ||
| ctk (Ctk)
New member Username: Ctk Post Number: 45 Registered: 7-2001 |
Which fuel line did you disconnect, the main inlet or one of the 8 fuel lines? The FD has two halves, the top half has control pressure and the return line and the bottom half has inlet and system pressure. The FD has 3 main parts. NEVER separate the two halves, it will leak and cannot be put back together successfully. The plunger can be removed and examined for score marks and the rubber o-ring. Don't drop it, the calibration is matched to the specific FD body and is not interchangeable. There is also a small piston like, spring loaded device on the lower half. This item lets you adjust system pressure. There is a rubber o-ring on this item too. Adjustment is by adding or removing shims, that increases or decreases system pressure. Please check your system and rest pressure first before attempting fuel system adjustments. Sounds like you have a fuel starvation problem when hot, it could be adjustment or it could be a fault. But with your reading for system and rest pressure, more can be deduced. I had a persistent fuel problem that stuck with me for two years!!! Finally traced it to a bad connection from the WUR to the return. Some mechanic had made a new fuel line and repalced it without record or telling anyone. Trouble was that on a WUR, there are two posts of different thread size, so you cannot mix them up when reassembling (you can guess this is quite vital). He managed to make a new fuel line in the right size for the wrong size post (no more return to tank but return to FD). The engine would overheat 15 minutes after starting and because the engine was so hot, I also had fuel vapourization problems. REALLY SMART. My engine is a turbocharged KOENIG with a very different type of engineering and fuel enrichment devices, nobody guessed what the problem was until I stripped down all the fuel injection parts and rebuilt and re-hosed the entire system and couldn't figure out why the WUR reteurn line was run the way it was. Talk about a mystery. | ||
| Richelson (Richelson)
Member Username: Richelson Post Number: 609 Registered: 12-2001 |
I am thinking that the plunger maybe stuck in the fuel dist. because the I removed a fuel line and tried to start the car when hot and no fuel came out of the line. I disconnected the switch and let the pump prime and build up pressure for a minute then turned the key and nothing. After it cooled down. Sure enough fuel came out of the fuel line. Would this confirm that this is in the fuel Dist.? Any specific checks for the FD. I am thinking I can pull it off and maybe clean the plunger. Ideas? | ||
| ctk (Ctk)
New member Username: Ctk Post Number: 44 Registered: 7-2001 |
If you have the ignition on and the plug disconnected, the fuel pump flows and if you don't try starting immediately, your engine floods with petrol. You will be able to smell it. Your second question,is about fuel pressure. I don't think it is your accumulator but the rest pressure. How's your system pressure reading? At worst, you've got a faulty metering head but it has to be abused quite badly. Leaking injectors are also something to think about. | ||
| Richelson (Richelson)
Member Username: Richelson Post Number: 604 Registered: 12-2001 |
Thanks for the info. I have another question. When it is disconnected it lets the fuel pump run when the key is in position before starting(pos. 2). Now, if it is disconnected and it still won't start what would it be. If you let the pump run for a minute with the connection disconnected it should build up pressure correct? If it still won't start after that would it be in the metering device or could it still be in the accumulator? | ||
| ctk (Ctk)
New member Username: Ctk Post Number: 43 Registered: 7-2001 |
Check your electrical relays, specifically the fuel pump and starter valve units that they are the right parts and that they have good contact. Also check your fuel system pressure and rest pressure. Finally, your pump pitch symptoms suggests that your sensor plate height maybe incorrectly set (gives wrong CO). | ||
| Greg Owens (Owens84qv)
Junior Member Username: Owens84qv Post Number: 233 Registered: 10-2001 |
I leave mine disconnected all of the time. After I purchased my car, I called the previous owner and mentioned that one of the clips at the rear of the fuel distribution / metering pump was disconnected. He mentioned that he too had been having problems until he disconnected it. I wouldn't let this bother you.  | ||
| Richelson (Richelson)
Member Username: Richelson Post Number: 601 Registered: 12-2001 |
Ok guys here is the latest on the QV I have been looking at. Remeber how it would take about 10 seconds to start when warm. Well, I looked at it again and the car now wouldn't start when warm after sitting for about 10 minutes. We tried and tried to start it. The fuel pump was coming on when the key was turning the engine over but it wouldn't start. After a little while I pulled the connection at the back of the fuel dist. and metering device. It fired right up. Is this a Large problem? When connected and not starting would the fuel pump come on anyway? I thought that this was a device to not let the car start if it got flipped over. Is it safe to leave it disconnected? Can it be repaired without replacement? Also, when the key is in the position right before the starter is turning the engine the fuel pump isn't on but when this switch is disconnected the fuel pump comes on when the key is in the position before starting but the fuel pump would change pitch after 3 seconds. Is this the way is should be? Any info would be great on this. I really like this QV but I am not sure about this. |