Relay advice

[Cincincy]

76 911 targa imported from Germany 1980 by US soldier.
Current milage ~75,000

Fuel pump not getting power,, cannot here it.

Plan is to replace all 3 relays 2 black and 1 red.

Question : should I disconnect the battery while I change out the Relays?

Question 2: any simple test I can try to verify fuel pump is bad?

Thanks

[timmy2]

Does your horn work?
If so, Just swap all other relays into it one at a time to test.
No need to disconnect battery to swap them.

Simple test for pump is to remove air filter cover, then with ignition in run position, lift the air metering plate from below for just a few seconds. You should hear the pump and possibly the injectors will “squeal “ as they load up with fuel.

[timmy2]

New members should post a picture of their car..

[proporsche]

As Dennis said or, another simple test with the ignition key off cross -witha little jumper fuse number 6 (direction from the windshield) with fuse 3 you should be able to hear the fuel pump..
Ivan

then let us know

[Cincincy]

thanks for all the help.

i did find one bad relay using the swap approach, will try some of the other things these coming days. this was a wedding weekend for a family member so have not had much spare time.

by the way , the reason my 76 911 only has 75,000 miles is i found jout many years ago they don't break as often if the stay in the garage.

so thanks again

[Cincincy]

thanks,, i will keep you posted...

[Cincincy]

Originally Posted by proporsche

As Dennis said or, another simple test with the ignition key off cross -witha little jumper fuse number 6 (direction from the windshield) with fuse 3 you should be able to hear the fuel pump..
Ivan

then let us know

Thanks for helping.

When you say jump 3 and 6
Do you mean jump from top of fuse 6 to the bottom of fuse 3?

I am slowly doing this since it's hot here and my garage is not cooled.
The relay was bad and #1 fuse was blown. Replaced both but still can't hear pump.
I might have blown the fuse screwing with the relays.

[pampadori]

Are you expecting to hear it prime before it starts from simply turning the key to "on"?
I seem to recall that CIS cars don't prime like that. That metering plate safety switch mentioned earlier needs to be raised by the vacuum of the engine cranking.

If you need a hand, I'm local to you and don't mind helping folks.

[Cincincy]

My how things are changing rapidly. But I am not holding my breath.

Could my 76 911 targa have been a Belgium police car
I purchased my car in 1980 from a US army officer who bought it back from Belgium to Ft Lee Virginia.
I was just doing Google searches to identify the exact location of the fuel pump. So I come across a wiki search that talks about a very small production run of 911 targas for the Belgium police. Now here's the real kicker, it has a sirene installed under the dash. I did not know what it was for many years but at some point a few years back I happened to find a button on bottom of dash and pushed it. Low and behold it turned the siren on.
I always just assumed it was part of a security system until I ran across the wiki article.

So does anyone know how /where I could validate my suspicion.?
Old Today, 10:05 PM

[Cincincy]

Yes. Thank you very much. I will keep that in mind. I am actually in prince George county just outside Hopewell. About 3 - 4 miles. It's unfortunate I can't drive it to a shop. I have spent most of of the last 12 months in and out of mcv with major health issues. So except for starting every 4-6 weeks it has not been out of the garage.

Fortunately I am finally feeling well enough to to address the problem with fuel pump. And in the process discovered it could be 1 of 20 police cars built for the Belgium government in 1976. Although I seriously doubt it is one but it does have a factory siren.

But thanks and I will keep in touch with you.

Henry Wilson

[proporsche]

Cinci ..here

[Cincincy]

Originally Posted by Cincincy

My how things are changing rapidly. But I am not holding my breath.

Could my 76 911 targa have been a Belgium police car
I purchased my car in 1980 from a US army officer who bought it back from Belgium to Ft Lee Virginia.
I was just doing Google searches to identify the exact location of the fuel pump. So I come across a wiki search that talks about a very small production run of 911 targas for the Belgium police. Now here's the real kicker, it has a sirene installed under the dash. I did not know what it was for many years but at some point a few years back I happened to find a button on bottom of dash and pushed it. Low and behold it turned the siren on.
I always just assumed it was part of a security system until I ran across the wiki article.

So does anyone know how /where I could validate my suspicion.?
Old Today, 10:05 PM

NO, ABSOLUTELY NOY.......

Glad this got resolved , now i ca get back to getting it running.

important info to determine :

Belgium police car had type 911/83 Engine with MFI

My 76 911 Targa has type 911/81 Engine with CSI

My 76 911 Targa has Engine SN 6362331

[boyt911sc]

Originally Posted by proporsche

Cinci ..here

Ivan,

The test procedure you suggested above will not work for ‘76-‘83 CIS simply because of the FP relay in these cars. Your suggested procedure is taken from the Carrera 3.2 (Motronic) Manual. We had previous discussions of this topic not too long ago with John Walker. Remember the thread?

Tony

[proporsche]

yes i realized Tony ,thanx..my bad ..i think i did it before;-)

Ivan

[Cincincy]

Originally Posted by pampadori

Are you expecting to hear it prime before it starts from simply turning the key to "on"?
I seem to recall that CIS cars don't prime like that. That metering plate safety switch mentioned earlier needs to be raised by the vacuum of the engine cranking.

If you need a hand, I'm local to you and don't mind helping folks.

Check your private messages

[Cincincy]

Originally Posted by timmy2

Does your horn work?
If so, Just swap all other relays into it one at a time to test.
No need to disconnect battery to swap them.

Simple test for pump is to remove air filter cover, then with ignition in run position, lift the air metering plate from below for just a few seconds. You should hear the pump and possibly the injectors will “squeal “ as they load up with fuel.

Thanks for your help.

I tried the test this morning, removed the air filter, (installed my $4000 hearing aids) and i do hear a very high pitch constant buzz so it must be getting power.

Can you suggest any additional test?

The battery is on a battery tender so it is fully charged.

thanks

[boyt911sc]

Originally Posted by Cincincy

76 911 targa imported from Germany 1980 by US soldier.
Current milage ~75,000

Fuel pump not getting power,, cannot here it.

Plan is to replace all 3 relays 2 black and 1 red.

Question : should I disconnect the battery while I change out the Relays?

Question 2: any simple test I can try to verify fuel pump is bad?

Thanks

Search for DKLever48’s thread about FP relay test thread in the Technical Forum.

Tony