 Fuel check valve and the 3port fuel pump |
|
|
|
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. |
|
|
| brant |
 Sep 10 2016, 07:54 AM
Post
#1
|
|
914 Wizard  Group: Members Posts: 11,624 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
 |
I think there must be a check valve built into the 3 port djet pump
I believe mine is not working (Hard starting symptoms) Has anyone pulled theirs apart? Pictures or a thread? I'm also wondering if adding an in line check valve would work? |
   |
 
|
  |
Replies
| brant |
Sep 10 2016, 08:48 AM
Post
#2
|
|
914 Wizard Group: Members Posts: 11,624 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
|
Ok it's just a bypass
So has anyone ever added a check valve? I imagine it adds some restriction to the system What would be the other reasons this is a bad idea? I'm having a hard start situation If I turn the key it is a 25 second crank before it starts If I turn the key off/on about 5 times and let the pump prime Then it will start instantly So I'm loosing pressure I figure it's either a bad/leaky injector or a situation where the system s draining back to the tank I will test fuel pressure and injectors when I get home But might also test the drain-back by adding a check valve? |
|
|
|
| sixnotfour |
Sep 10 2016, 08:56 AM
Post
#3
|
|
914 Wizard Group: Members Posts: 10,432 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains
|
QUOTE(brant @ Sep 10 2016, 06:48 AM)  Ok it's just a bypass So has anyone ever added a check valve? I imagine it adds some restriction to the system What would be the other reasons this is a bad idea? I'm having a hard start situation If I turn the key it is a 25 second crank before it starts If I turn the key off/on about 5 times and let the pump prime Then it will start instantly So I'm loosing pressure I figure it's either a bad/leaky injector or a situation where the system s draining back to the tank I will test fuel pressure and injectors when I get home But might also test the drain-back by adding a check valve? filters dirty or pumps bad , use a 2port later pump..relax |
|
|
|
Posts in this topic
brant Fuel check valve and the 3port fuel pump Sep 10 2016, 07:54 AM
sixnotfour its a pressure bypass , not a check valve
Remembe... Sep 10 2016, 08:03 AM Dave_Darling The pump itself acts as a check valve, at least to... Sep 10 2016, 10:49 AM
brant
The pump itself acts as a check valve, at least t... Sep 12 2016, 10:22 AM John My suggestion would be to recheck the lines under ... Sep 12 2016, 11:08 AM Eric_Shea Time for one of these:
http://www.914world.com/bb... Sep 12 2016, 11:12 AM Elliot Cannon I had an issue like that with a '79 911. It w... Sep 12 2016, 11:13 AM brant I can easily pull the pump this weekend.
I added a... Sep 12 2016, 11:21 AM John From what I recall (this is from memory) on the 3 ... Sep 12 2016, 07:30 PM Dave_Darling Definitely check the pressure. You're only sp... Sep 12 2016, 08:35 PM rhodyguy Have you looked down the fill opening and glaced a... Sep 13 2016, 12:51 PM brant
Have you looked down the fill opening and glaced ... Sep 13 2016, 01:02 PM John Just for giggles, you might want to check pressure... Sep 13 2016, 07:14 PM sixnotfour put a 2 port pump in,, problem gone..the roller va... Sep 13 2016, 08:25 PM brant
put a 2 port pump in,, problem gone..the roller v... Sep 13 2016, 09:02 PM sixnotfour
put a 2 port pump in,, problem gone..the roller ... Sep 13 2016, 09:15 PM brant Question
I know the injectors fire in pairs
Whe... Sep 19 2016, 07:50 PM brant So Brad Anders website indicates their is a check ... Sep 22 2016, 11:40 AM BeatNavy
◦Failed Check Valve: The check valve keeps the ... Sep 22 2016, 01:22 PM 87m491 I don't know D-jet at all compared to my CIS c... Sep 22 2016, 01:51 PM brant
◦Failed Check Valve: The check valve keeps the... Sep 22 2016, 04:03 PM BeatNavy
That sounds like exactly the same symptoms
I too ... Sep 22 2016, 06:09 PM Dave_Darling
I too would love to know if a stock djet system m... Sep 23 2016, 09:56 AM brant
I too would love to know if a stock djet system ... Sep 23 2016, 11:47 AM BeatNavy
How do test the pressure regulator?
It sits at 29... Sep 23 2016, 12:17 PM Dave_Darling I think the references to "check valve" ... Sep 23 2016, 04:27 PM brant
I think the references to "check valve... Sep 23 2016, 04:40 PM brant I fixed it
Will keep testing after it cools down ... Sep 23 2016, 07:32 PM BeatNavy Did you have to break open the pump to get to that... Sep 24 2016, 05:56 AM brant Some details
I may get a better picture when I ge... Sep 25 2016, 09:22 AM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 17th May 2024 - 03:18 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.