fuel pump surging, why?? |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
fuel pump surging, why?? |
Tab914 |
Aug 1 2005, 06:52 PM
Post
#21
|
Member Group: Members Posts: 158 Joined: 25-April 04 From: Alexandria, Ontario, Canada Member No.: 1,978 Region Association: Canada |
Another one for you guys...........
Here is the problem I am trying to fix. Whenever the needle in the temp guage gets to about 1/4 the fuel pump starts surging. This causes the idle to start to go up and down in rythm with the fuel pump. Also when under load the car stutters and shudders and kinda wants to choke. Before the car gets up to that temp. it runs nice and smooth, strong on acceleration and no poping or backfiring on decel or anything. Just sounds great and runs fine. Idle is where it should be and fuel pump does not surge. Here is what has been done. -Valve adjustement -Dwell adjustement -Timing adjustement -Tested MPC as per proper ohms. Parts I have changed- coil, plugs, ignition points, trigger points, condenser, rotor, cap and wires. Questions:- what could make the pump surge like that? -does it make a difference how the MPC wire goes into it's conector? -How do I properly check the head temp sensor. -Could the intake temp. sensor be the cause. I am at a lost. Feel like I am going in circles. (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif) Has anyone had this kind of problem?? Desperate for advice. (IMG:http://www.914world.com/bbs2/html/emoticons/sad.gif) Thanks, Dominic. forgot to add. car is a 1974 2.0 with stock fuel injection. |
mihai914 |
Aug 4 2005, 08:36 PM
Post
#22
|
Senior Member Group: Members Posts: 800 Joined: 2-March 05 From: Montreal, QC Member No.: 3,697 Region Association: None |
Dominic, you've got a major problem right there.
That would explain why the pump was changed before and why you will keep changing it unless you do things the way they were supposed to be done, correctly. It is a must to have the fuel filter before the fuel pump. I reallly think now that you probably have loads of crap in the gas tank and occasionnaly it causes your fuel pump to work harder. You can probably use a 8mm/8mm filter, it will just be tight to get on the 7mm hose. I say don't rush the fix for the weekend, remove everything over the weekend, clean as much as you can. During the week order a correct fuel filter and plan on reinstalling everything next weekend. BTW you should leave the old filter where it is now as a second backup filter, there is nothing wrong with having two. I'll try and find you a correct diagram for the relocation of the fuel pump. |
Lo-Fi Version | Time is now: 1st June 2024 - 10:20 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |