I've been chasing this Gremlin for 3 days now, no luck.
Here's the overview:
1- Car was running great, just stalling in turns with less than 1/4 tank gas. I pull in-tank sender unit out to inspect short hose. I broke soldered wires on unit lid inside. Parts yard did not have a 1987 replacement, I am told 1988 is a different unit.

2- I pull a 1988 unit anyway and see the only difference in wiring is the snap on connector is different. So, I hard wire the unit in place. Car starts - runs rough. I drive to gas station (3 blocks) and put just under 1/2 tank gas. I barely make it home.

3- I check the fuel sender ground - tighten it. Car starts and idles strong. I go 4 blocks and the car died. It never started again after that.

5- After several removals and installs of the sender unit, and fuel pump and filter - here is what I have:

--New fuel pump. It is getting power and works
--Fuel relay has 2 clicks. It works
--New fuel filter
--New in-tank filter sock
--Fuses are OK
--I disconnected all hoses today and blew air. No hoses seemed blocked.
--No fuel came out of the fuel line at the rail on the engine.
--The fuel filter was clear
--The attachments on the filter/pump were clear
--I blew in the metal tubes on the sender unit and pressure pushed gas out both tubes. Gas can get in/out of the tank.


Now, the bolt that secures the fuel line from the filter to the engine was bone dry. It appears I am not getting fuel passed the filter. I double checked and the filter is in the same direction as the old one.

I wired the pump with Purple on the positive and black on the negative.

If the pump works, the hoses are clear -- why no fuel passed the filter and to the engine?

Thanks,
Jamie


1987 740 GLE 203,000
1985 245 DL 230,000

How about signing in as a registered user? I'll give a few things to check.
--
john

I forgot the password the board gave to me sorry. I'm still looking.

Found it!

OK, no fuel is getting into the filter/pump.
I am now 90% sure the new sending unit is the culprit and PERHAPS the pump is drawing in air.

I would like to try and remove the return and inward fuel lines from the rail, run the pump and see if I can prime the lines. If I do that, I might pull the sender again and see if it has cracks or something letting air in.

How does that sound?

I would remove the inlet line to the main fuel pump and briefly crank the engine. Be prepared for some fuel. Have a fine extinguisher handy. If you don't pump fuel out, then you probably have reverse polarity on the in tank pump. Change polarity and check for fuel pumping out.

You don't need to prime the fuel lines. If there is fuel getting to the main pump, the air will be soon be purged from the system.
--
john

Thanks John,
This morning I removed the main inlet to the pump, and using the return line at the fuel rail, I blew into the hose until fuel came pouring out at the pump. I reconnected and still never got fuel to the rail.

The in-tank pump seems to only be able to be wired one way. The purple wire goes to the pump and the other two go to the gauge. Gray/white on gray/white and brown on brown.

jamie