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sciroccosteve
Joined: 16 Apr 2012
Posts: 215
Location: Rochester, NY
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 Posted: Tue May 01, 2012 6:54 am Post subject: fuel pump relay, whooda thunk it |
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So, I may have mentioned before when discussing my fuel system issues I was having that my fuel pump kicked on and didnt turn off, pre crank. Also noted it was highly loud.
I had a fuel pump relay from a vw laying around, swapped it in...no change.
So I was perusing pelican the other night, and picked up a bunch of stuff including a new relay.
Put it in today and I'll be jiggered.....The pump is much quieter, doesn't stay on, and it would appear all fuel issues have been finally resolved.
How odd I say, how odd.
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1979 924
2000 V6 Passat
"Let the fools have their tar tar sauce."
C. Montgomery Burns |
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markmazour
Joined: 29 Sep 2008
Posts: 37
Location: Vermillion, South Dakota
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| Posted: Sat Jun 30, 2012 5:00 am Post subject: |
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Steve,
Would you say what you are experiencing now is the OEM intended behavior?
I ask this because I am having difficulty starting my car, ok it won't start at all. It had been running and starting fine until last night I hopped in for a joy ride and it turned over and over and over... well you understand. I started thinking and poking around and it dawned on me that I was not hearing the fuel pump which I would normally hear when the ignition was in the on position, kind of a zrt...zrt...zrt... at the same rate of the blinkers. I guess my next step is to apply 12 volts to the pump leads to see if it functions followed by a fuse and relay inspection/replacement.
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Mark
1982 Porsche 924 Indiana Red Metallic SOLD
2001 BMW 325i Silver SOLD
2011 BMW335is Space Gray 6mt |
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ninpo4me
Joined: 29 Oct 2011
Posts: 147
Location: SoCal, CA
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| Posted: Sat Jun 30, 2012 11:21 am Post subject: |
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Please tell me more, I would love to put a new relay into my car as a "just in case"
I am trying to replace anything that would lever me stranded, as I plan on driving my car often
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Love me some toofa' |
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markmazour
Joined: 29 Sep 2008
Posts: 37
Location: Vermillion, South Dakota
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| Posted: Sat Jun 30, 2012 10:36 pm Post subject: |
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Last night I pulled the relay tapped it 4-6 times on the ground popped it back in and it started right up! I am ordering a new one today!
I the the past when the ignition was turned on I would hear the fuel pump going zzrrt...zzrrt...zzrrt...zzrrt...zzrrt...zzrrt...zzrrt...and it would not stop until the engine was started then I would barely hear the quiet hum of the fuel pump. Now after the tapping trick I hear zzrrtr...zzrrt...and it stops, I believe this to be the correct operation.
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Mark
1982 Porsche 924 Indiana Red Metallic SOLD
2001 BMW 325i Silver SOLD
2011 BMW335is Space Gray 6mt |
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ninpo4me
Joined: 29 Oct 2011
Posts: 147
Location: SoCal, CA
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| Posted: Sun Jul 01, 2012 12:07 pm Post subject: |
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Could you post the link as to where you bought a new fuel relay? I would love to buy a pair.
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Love me some toofa' |
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old 924
Joined: 06 Mar 2012
Posts: 184
Location: clinton twp MI. USA
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| Posted: Sun Jul 01, 2012 9:43 pm Post subject: |
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| ninpo4me wrote: | | Could you post the link as to where you bought a new fuel relay? I would love to buy a pair. |
the 76 to 78 are N/L/A..you have to buy them used or have them rebuilt ,if you can find some place to do it ..i looked for i long time to find new one's ..no one make's them any more..some one was nice enough to send me a pair but i have'nt been able to work on the car to find out if they even work, witch i pray they do cuz you can't find them.. 
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base 77 924 2.0 (may the porsche be with you) |
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jim kleyh
Joined: 24 Apr 2012
Posts: 55
Location: pine falls, manitoba, canada
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| Posted: Thu Jul 05, 2012 6:29 am Post subject: relay |
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Hey from Canada!! Happy 4th!! I bought my 77 months ago and finally got it into the shop. It came with 4-5 fuel relays but whether they work or not. the PO said the car wouldn't start and just kept putting relays into the car. It's been sitting for 10 years so who knows. I got it started first crack, just luck?? run like an old donkey. If these relays do work I may have one for you. I'll let you know next week. JIM
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oldcarman-77 porsche 924 and one of the ugliest motorhomes on earth. |
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sciroccosteve
Joined: 16 Apr 2012
Posts: 215
Location: Rochester, NY
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| Posted: Thu Jul 05, 2012 8:43 am Post subject: |
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| markmazour wrote: | Steve,
Would you say what you are experiencing now is the OEM intended behavior?
I ask this because I am having difficulty starting my car, ok it won't start at all. It had been running and starting fine until last night I hopped in for a joy ride and it turned over and over and over... well you understand. I started thinking and poking around and it dawned on me that I was not hearing the fuel pump which I would normally hear when the ignition was in the on position, kind of a zrt...zrt...zrt... at the same rate of the blinkers. I guess my next step is to apply 12 volts to the pump leads to see if it functions followed by a fuse and relay inspection/replacement. |
Of all the german cars I have ever owned(eighteen) it is always the relay.
_________________
1979 924
2000 V6 Passat
"Let the fools have their tar tar sauce."
C. Montgomery Burns |
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Lambsey
Joined: 10 Jul 2012
Posts: 3
Location: North Devon, UK
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| Posted: Tue Jul 10, 2012 4:42 pm Post subject: |
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I would say, having had 3 relays and a swapped in fuel pump in the last 1000 miles, to renew the earth strap from the battery and string another one onto the engine block. My fuel pump now purrrs rather than roaring and all other electrical things seem to be working much better.
I came to the conclusion that cranking over + fuel pump load was too much and so I cooked the relays and old pump. I now have an 'old fashioned' relay with the fuse on top, which melted a week ago before I did the mods.... |
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scm924s
Joined: 22 Oct 2010
Posts: 268
Location: Gloucester UK
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| Posted: Tue Jul 10, 2012 11:04 pm Post subject: |
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Has anyone successfully used any other relay in the '77 model other than the original 6 pin fused one?
_________________
1984 n/a Ruby Red Metallic
1988 924S Guards red- sold
1986 924S Guards Red - sold
1984 n/a Black - sold
1980 n/a Le Mans#1 - sold
1980 n/a Le Mans#2- sold
1977 Martini - sold |
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Lambsey
Joined: 10 Jul 2012
Posts: 3
Location: North Devon, UK
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| Posted: Wed Jul 11, 2012 5:31 am Post subject: |
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| Quote: | | Has anyone successfully used any other relay in the '77 model other than the original 6 pin fused one? |
I am told (by a very well respected guru) that to be able to use a fuse on top version where the design for a later version relay was used is a "no-no", but I am definitely running such. Apparently the use of a later relay in an older car is even more of an issue.
Sorry to be the bearer of bad news  |
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scm924s
Joined: 22 Oct 2010
Posts: 268
Location: Gloucester UK
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| Posted: Wed Jul 11, 2012 6:37 pm Post subject: |
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I would certainly not recommend a non fused one as this is the only circuit fuse on cars not fitted with the additional fuse board (post 78?), but I have a 5 pin fused one which is ex VW which I am curious about.
Alternatively a relay with an inline fuse protection might serve if I understood these things!
_________________
1984 n/a Ruby Red Metallic
1988 924S Guards red- sold
1986 924S Guards Red - sold
1984 n/a Black - sold
1980 n/a Le Mans#1 - sold
1980 n/a Le Mans#2- sold
1977 Martini - sold |
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Lambsey
Joined: 10 Jul 2012
Posts: 3
Location: North Devon, UK
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| Posted: Thu Jul 12, 2012 5:23 am Post subject: |
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| scm924s wrote: | I would certainly not recommend a non fused one as this is the only circuit fuse on cars not fitted with the additional fuse board (post 78?), but I have a 5 pin fused one which is ex VW which I am curious about.
Alternatively a relay with an inline fuse protection might serve if I understood these things! |
Definitely a huge no-no. The fuel pump relay operates as a switch. In certain conditions it turns the pump ON. If those conditions aren't met then the pump is turned OFF. Therefore the relay is not looking for conditions on a VW but a Porsche. When my first one sicked out the spanners man proved it by using a known "good" FPR from a VW.....it 'worked' to prove the diagnosis but it kept switching in and out. The 924 wiring is delicate enough without adding relays not intended for the job. If you have a relay with a fuse on top then you need to have that and no other. I have the feeling that your actual fuel pump will be different, too.....  |
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