No power to in-tank fuel pump.

Lee Shall · Post by **Lee Shall** » 14 Feb 2005, 11:28

I'm not getting any power to the in-tank fuel pump when the key is turned on. Fuse #4 (labeled as for the in-tank pump) is also not getting energized.
What's the fix?
TIA,
Lee M. Shall

Lee Shall · Post by **Lee Shall** » 14 Feb 2005, 11:36

Probably should have mentioned the vehicle is an '86 240DL.
TIA,
Lee M. Shall

Lee Shall · Post by **Lee Shall** » 14 Feb 2005, 16:08

Update - Update

By removing the 3523608-2 (main relay?) located behind the passenger kick panel and jumping a wire across terminals 30 & 87/2 I get power to both the in-tank and main fuel pump. I've disconnected the fuel line at the engine and get a good flow of gasoline whilst jumping these terminals.
I'm thinking this proves the pumps are OK and the problem is with the relay. I've got a new relay ordered and it will arrive and be installed tomorow.
Anybody think I'm on the right track or am I just whistling Dixie?

TIA,
Lee M. Shall

Kmaniac in California USA · Post by **Kmaniac in California USA** » 14 Feb 2005, 18:35

Sounds like you are on the right track. I have a 1986 740 GLE. I spent quite a bit of time diagnosing my fuel injection system. The single fuel pump relay powers both pumps. Given what you have described, it sounds like a bad relay.

Do a topic search on fuel pumps and you can read about my fuel system woes and solutions.

ronbrn1 · Post by **ronbrn1** » 21 Oct 2005, 04:44

my car is not getting power to in tank pump and outside also but relay was replace and terminal was jumped with jumper wire and no current...

Guest · Post by **Guest** » 26 Oct 2005, 16:56

On my sons 1981 240 the electrical terminal on the top of the fuel tank went bad and was not allowing electricty to the pre pump.