L-jet fuel pump question |
|
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. |
|
L-jet fuel pump question |
High Path |
Jun 22 2010, 02:40 PM
Post
#1
|
Newbie Group: Members Posts: 26 Joined: 29-June 09 From: Edina, MN Member No.: 10,516 Region Association: Upper MidWest |
I have a 1974 1.8
while the car is idling I can hear the fuel pump running (it is a non-Porsche part, moved to the front trunk by PO), however it isn't running consistently. I hear it wax and wane over the period of a few seconds. Kind of like a rotating tornado siren, only faster (and quieter (IMG:style_emoticons/default/smile.gif) ) So here is my question... is this normal, or should it be running at a constant pitch whenever the car is running. If it is normal for it to wax and wane, what signal is telling the pump to slow down, then speed up again, all while under a constant load (parked and idling). The reason I ask is that the fuel pump hasn't run for a year, and I just recently got it running (high resistance connection on relay board, subject for another post). Last year the car ran well enough to take out on the highway, but I thought I was hearing a continuous pitch from the fuel pump. Now the car cuts out on acceleration and struggles to go around the block. Thanks |
Cupomeat |
Jun 22 2010, 02:43 PM
Post
#2
|
missing my NY 914 in VA Group: Members Posts: 1,336 Joined: 26-November 07 From: Oakton VA Member No.: 8,376 Region Association: MidAtlantic Region |
As these Bosch FI system use a closed loop fuel system, with a regulator, the pumps should run at a constant pitch and rate, all the time.
Check the electrical connections on this one and continue trouble shooting from there. On my L-jet with a stock pump (35 yrs old) and stock mounting, I cannot hear the pump, ever. ...btw, that is not because the car does not run, (IMG:style_emoticons/default/happy11.gif) |
Drums66 |
Jun 22 2010, 03:39 PM
Post
#3
|
914 Rudiments Group: Members Posts: 5,321 Joined: 15-January 03 From: Coronado,Cali Member No.: 151 Region Association: Southwest Region |
[quote name='Cupomeat' date='Jun 22 2010, 01:43 PM' post='1333827']
On my L-jet with a stock pump (35 yrs old) and stock mounting, I cannot hear the pump, ever. I think that signal's a problem(noise) (IMG:style_emoticons/default/sad.gif) |
Lo-Fi Version | Time is now: 2nd June 2024 - 04:35 PM |
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 ... |