Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
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.
 

Welcome Guest ( Log In | Register )

 
 Reply to this topicStart new topic
> Engine 1.7 won't start, No start after re-built
aoor0708
post Jan 19 2020, 11:34 AM
Post #1


Newbie
*

Group: Members
Posts: 6
Joined: 29-November 19
From: Belgium
Member No.: 23,684
Region Association: None
Have problems with 1972- 1.7 engine. Engine will not start. Question : Does the fuel pump start when switching ignition ON or does pump only work when cranking ?
Thanks for help.
Andre
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
BeatNavy
post Jan 19 2020, 11:50 AM
Post #2


Certified Professional Scapegoat
****

Group: Members
Posts: 2,924
Joined: 26-February 14
From: Easton, MD
Member No.: 17,042
Region Association: MidAtlantic Region
I assume this is 1.7L D-Jet Fuel Injection, correct? If that's the case, the fuel pump should "prime" (you should hear an audible buzz) for about one to two seconds when you turn ignition on. Fuel pump will not run if it's not plugged in correctly to the relay board or if those grounds are disconnected from case. There are other things to check, but those are two likely issues.

Edit: clarified that it's when you turn ignition on you should hear fuel pump prime.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
RKramden
post Jan 20 2020, 10:31 AM
Post #3


Newbie
*

Group: Members
Posts: 41
Joined: 26-October 19
From: So. California
Member No.: 23,589
Region Association: Southern California
QUOTE(BeatNavy @ Jan 19 2020, 12:50 PM) *

I assume this is 1.7L D-Jet Fuel Injection, correct? If that's the case, the fuel pump should "prime" (you should hear an audible buzz) for about one to two seconds when you turn ignition on. Fuel pump will not run if it's not plugged in correctly to the relay board or if those grounds are disconnected from case. There are other things to check, but those are two likely issues.

Edit: clarified that it's when you turn ignition on you should hear fuel pump prime.

Beat Navy, sorry this is my first post ever, I don't know if I am even typing in the correct location, but I am having an issue with my '74 LJet. Pump starts with ignition, Pump runs when Air sensor arm is moved. However when starting, it seems that the air sensor is somehow cutting off the fuel pump circuit. The PO had bent the arm so it never opened, but I have bent it back to move as designed. If I disconnect the electrical plug to the Air Sensor, it starts and runs fine......any thoughts? BTW I have replaced the dual relay, but that did not fix the problem.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
dr914@autoatlanta.com
post Jan 20 2020, 10:35 AM
Post #4


914 Guru
*****

Group: Members
Posts: 7,835
Joined: 3-January 07
From: atlanta georgia
Member No.: 7,418
Region Association: None
andre, maybe you could call us and we will work through the issue


QUOTE(aoor0708 @ Jan 19 2020, 10:34 AM) *

Have problems with 1972- 1.7 engine. Engine will not start. Question : Does the fuel pump start when switching ignition ON or does pump only work when cranking ?
Thanks for help.
Andre
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
BeatNavy
post Jan 20 2020, 10:37 AM
Post #5


Certified Professional Scapegoat
****

Group: Members
Posts: 2,924
Joined: 26-February 14
From: Easton, MD
Member No.: 17,042
Region Association: MidAtlantic Region
QUOTE(RKramden @ Jan 20 2020, 11:31 AM) *

QUOTE(BeatNavy @ Jan 19 2020, 12:50 PM) *

I assume this is 1.7L D-Jet Fuel Injection, correct? If that's the case, the fuel pump should "prime" (you should hear an audible buzz) for about one to two seconds when you turn ignition on. Fuel pump will not run if it's not plugged in correctly to the relay board or if those grounds are disconnected from case. There are other things to check, but those are two likely issues.

Edit: clarified that it's when you turn ignition on you should hear fuel pump prime.

Beat Navy, sorry this is my first post ever, I don't know if I am even typing in the correct location, but I am having an issue with my '74 LJet. Pump starts with ignition, Pump runs when Air sensor arm is moved. However when starting, it seems that the air sensor is somehow cutting off the fuel pump circuit. The PO had bent the arm so it never opened, but I have bent it back to move as designed. If I disconnect the electrical plug to the Air Sensor, it starts and runs fine......any thoughts? BTW I have replaced the dual relay, but that did not fix the problem.

You're all good, posting in the right forum. But I don't know squat about L-Jet (beyond that the air sensor needs to move for fuel pump to run). There are plenty of L-Jet gurus on the board here (e.g., @ClayPerrine ) who will hopefully chime in to offer help. If nobody responds, I'd recommend starting a new thread with L-Jet in the title so that will "draw them in." (IMG:style_emoticons/default/smile.gif)

Edit: And (IMG:style_emoticons/default/welcome.png)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
RKramden
post Jan 20 2020, 01:59 PM
Post #6


Newbie
*

Group: Members
Posts: 41
Joined: 26-October 19
From: So. California
Member No.: 23,589
Region Association: Southern California
QUOTE(BeatNavy @ Jan 20 2020, 11:37 AM) *

QUOTE(RKramden @ Jan 20 2020, 11:31 AM) *

QUOTE(BeatNavy @ Jan 19 2020, 12:50 PM) *

I assume this is 1.7L D-Jet Fuel Injection, correct? If that's the case, the fuel pump should "prime" (you should hear an audible buzz) for about one to two seconds when you turn ignition on. Fuel pump will not run if it's not plugged in correctly to the relay board or if those grounds are disconnected from case. There are other things to check, but those are two likely issues.

Edit: clarified that it's when you turn ignition on you should hear fuel pump prime.

Beat Navy, sorry this is my first post ever, I don't know if I am even typing in the correct location, but I am having an issue with my '74 LJet. Pump starts with ignition, Pump runs when Air sensor arm is moved. However when starting, it seems that the air sensor is somehow cutting off the fuel pump circuit. The PO had bent the arm so it never opened, but I have bent it back to move as designed. If I disconnect the electrical plug to the Air Sensor, it starts and runs fine......any thoughts? BTW I have replaced the dual relay, but that did not fix the problem.

You're all good, posting in the right forum. But I don't know squat about L-Jet (beyond that the air sensor needs to move for fuel pump to run). There are plenty of L-Jet gurus on the board here (e.g., @ClayPerrine ) who will hopefully chime in to offer help. If nobody responds, I'd recommend starting a new thread with L-Jet in the title so that will "draw them in." (IMG:style_emoticons/default/smile.gif)

Edit: And (IMG:style_emoticons/default/welcome.png)

Thanks for the suggestion, I will see if I can start something.....
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
wndsrfr
post Jan 20 2020, 02:26 PM
Post #7


Senior Member
***

Group: Members
Posts: 1,428
Joined: 30-April 09
From: Rescue, Virginia
Member No.: 10,318
Region Association: MidAtlantic Region
QUOTE(BeatNavy @ Jan 19 2020, 09:50 AM) *

I assume this is 1.7L D-Jet Fuel Injection, correct? If that's the case, the fuel pump should "prime" (you should hear an audible buzz) for about one to two seconds when you turn ignition on. Fuel pump will not run if it's not plugged in correctly to the relay board or if those grounds are disconnected from case. There are other things to check, but those are two likely issues.

Edit: clarified that it's when you turn ignition on you should hear fuel pump prime.

(IMG:style_emoticons/default/agree.gif) For first start, cycle the ignition off & on maybe ten times to get the fuel pressure up in the engine bay...after that it should hold pressure and not need cycling....
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
aoor0708
post Jan 22 2020, 12:54 PM
Post #8


Newbie
*

Group: Members
Posts: 6
Joined: 29-November 19
From: Belgium
Member No.: 23,684
Region Association: None
QUOTE(wndsrfr @ Jan 20 2020, 02:26 PM) *

QUOTE(BeatNavy @ Jan 19 2020, 09:50 AM) *

I assume this is 1.7L D-Jet Fuel Injection, correct? If that's the case, the fuel pump should "prime" (you should hear an audible buzz) for about one to two seconds when you turn ignition on. Fuel pump will not run if it's not plugged in correctly to the relay board or if those grounds are disconnected from case. There are other things to check, but those are two likely issues.

Edit: clarified that it's when you turn ignition on you should hear fuel pump prime.

(IMG:style_emoticons/default/agree.gif) For first start, cycle the ignition off & on maybe ten times to get the fuel pressure up in the engine bay...after that it should hold pressure and not need cycling....


Thanks to everybody for the support. Problem is solved. Loose contact on the fuel pump (IMG:style_emoticons/default/aktion035.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 6th May 2024 - 12:45 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
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 ...