 Fuel issue., Low voltage? |
|
|
|
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. |
|
|
  |
| Tjmrfe |
 Aug 29 2021, 03:03 PM
Post
#1
|
|
NON IMPEDING RATIONE COGITATIONIS  Group: Members Posts: 132 Joined: 10-April 15 From: Cornwall on Hudson, New York Member No.: 18,612 Region Association: North East States  |
Hey all,
So, my motor is (75’ 1.8 stock EFI) back in the car, with assistance from a very helpful 914 world member! (thank you again Rory) and it won’t start…first I figure I’ll check the basic stuff, fuel? my pump doesn’t make any noise…so I Put my meter on the pump leads, while turning key, and I opened flap on intake… I get 9vdc….so next I go to pin 88d- 9vdc. At pin 86 I’m getting 9vdc….at pin 88y I’m getting 12vdc…soooooo, Took my battery to the pump, + to + and - to - my pump works just fine…. But somehow I’m loosing 2 Volts along the way? Any one else had something like this? Doesn’t seem to make sense, I’m getting a voltage drop? Is there another stop along the way that the pump feed would loose that 2 volts? thanks as always. |
   |
 
|
| Tjmrfe |
Aug 31 2021, 01:51 PM
Post
#2
|
|
NON IMPEDING RATIONE COGITATIONIS Group: Members Posts: 132 Joined: 10-April 15 From: Cornwall on Hudson, New York Member No.: 18,612 Region Association: North East States |
QUOTE(Tjmrfe @ Aug 29 2021, 01:03 PM)  Hey all, So, my motor is (75’ 1.8 stock EFI) back in the car, with assistance from a very helpful 914 world member! (thank you again Rory) and it won’t start…first I figure I’ll check the basic stuff, fuel? my pump doesn’t make any noise…so I Put my meter on the pump leads, while turning key, and I opened flap on intake… I get 9vdc….so next I go to pin 88d- 9vdc. At pin 86 I’m getting 9vdc….at pin 88y I’m getting 12vdc…soooooo, Took my battery to the pump, + to + and - to - my pump works just fine…. But somehow I’m loosing 2 Volts along the way? Any one else had something like this? Doesn’t seem to make sense, I’m getting a voltage drop? Is there another stop along the way that the pump feed would loose that 2 volts? thanks as always. |
|
|
|
| jrmdir |
Aug 31 2021, 02:34 PM
Post
#3
|
|
Member Group: Members Posts: 224 Joined: 13-May 21 From: Central Ohio Member No.: 25,544 Region Association: Upper MidWest 
|
QUOTE(Tjmrfe @ Aug 31 2021, 03:51 PM) QUOTE(Tjmrfe @ Aug 29 2021, 01:03 PM) Hey all, So, my motor is (75’ 1.8 stock EFI) back in the car, with assistance from a very helpful 914 world member! (thank you again Rory) and it won’t start…first I figure I’ll check the basic stuff, fuel? my pump doesn’t make any noise…so I Put my meter on the pump leads, while turning key, and I opened flap on intake… I get 9vdc….so next I go to pin 88d- 9vdc. At pin 86 I’m getting 9vdc….at pin 88y I’m getting 12vdc…soooooo, Took my battery to the pump, + to + and - to - my pump works just fine…. But somehow I’m loosing 2 Volts along the way? Any one else had something like this? Doesn’t seem to make sense, I’m getting a voltage drop? Is there another stop along the way that the pump feed would loose that 2 volts? thanks as always. Did you try swapping out the relay with one of the others to see if anything changes? Ron EDIT: Swapping the usual relays doesn't apply to 1.8 I guess. See this post and check out the "dual relay" http://forums.pelicanparts.com/porsche-914...-fuel-pump.html |
|
|
|
| Tjmrfe |
Aug 31 2021, 04:51 PM
Post
#4
|
|
NON IMPEDING RATIONE COGITATIONIS Group: Members Posts: 132 Joined: 10-April 15 From: Cornwall on Hudson, New York Member No.: 18,612 Region Association: North East States |
QUOTE(jrmdir @ Aug 31 2021, 12:34 PM) QUOTE(Tjmrfe @ Aug 31 2021, 03:51 PM) QUOTE(Tjmrfe @ Aug 29 2021, 01:03 PM) Hey all, So, my motor is (75’ 1.8 stock EFI) back in the car, with assistance from a very helpful 914 world member! (thank you again Rory) and it won’t start…first I figure I’ll check the basic stuff, fuel? my pump doesn’t make any noise…so I Put my meter on the pump leads, while turning key, and I opened flap on intake… I get 9vdc….so next I go to pin 88d- 9vdc. At pin 86 I’m getting 9vdc….at pin 88y I’m getting 12vdc…soooooo, Took my battery to the pump, + to + and - to - my pump works just fine…. But somehow I’m loosing 2 Volts along the way? Any one else had something like this? Doesn’t seem to make sense, I’m getting a voltage drop? Is there another stop along the way that the pump feed would loose that 2 volts? thanks as always. Did you try swapping out the relay with one of the others to see if anything changes? No I but I do have another dual relay, I’ll give that a shot, Thanks… Ron EDIT: Swapping the usual relays doesn't apply to 1.8 I guess. See this post and check out the "dual relay" http://forums.pelicanparts.com/porsche-914...-fuel-pump.html |
|
|
|
| Tjmrfe |
Aug 31 2021, 07:12 PM
Post
#5
|
|
NON IMPEDING RATIONE COGITATIONIS Group: Members Posts: 132 Joined: 10-April 15 From: Cornwall on Hudson, New York Member No.: 18,612 Region Association: North East States |
QUOTE(Tjmrfe @ Aug 31 2021, 02:51 PM) QUOTE(jrmdir @ Aug 31 2021, 12:34 PM) QUOTE(Tjmrfe @ Aug 31 2021, 03:51 PM) QUOTE(Tjmrfe @ Aug 29 2021, 01:03 PM) Hey all, So, my motor is (75’ 1.8 stock EFI) back in the car, with assistance from a very helpful 914 world member! (thank you again Rory) and it won’t start…first I figure I’ll check the basic stuff, fuel? my pump doesn’t make any noise…so I Put my meter on the pump leads, while turning key, and I opened flap on intake… I get 9vdc….so next I go to pin 88d- 9vdc. At pin 86 I’m getting 9vdc….at pin 88y I’m getting 12vdc…soooooo, Took my battery to the pump, + to + and - to - my pump works just fine…. But somehow I’m loosing 2 Volts along the way? Any one else had something like this? Doesn’t seem to make sense, I’m getting a voltage drop? Is there another stop along the way that the pump feed would loose that 2 volts? thanks as always. Did you try swapping out the relay with one of the others to see if anything changes? No I but I do have another dual relay, I’ll give that a shot, Thanks… Ron EDIT: Swapping the usual relays doesn't apply to 1.8 I guess. See this post and check out the "dual relay" http://forums.pelicanparts.com/porsche-914...-fuel-pump.html Thank you, turned out that Pelican article helped, the dual really was the fault, it had been an old one. |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 17th May 2024 - 07:03 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.