Ronnie, You suggested putting this on the fuel line in the middle of the car. I assume you mean literally beneath the car and no where near the engine compartment, correct? If this is the case, I assume I will have to crawl under the car or put it up on a lift, correct? TNX Steve
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I believe it is part of the fuel pump module that is located inside the fuel tank. Instead of a regulator on the fuel rail they have a fuel rail pressure sensor.... only one pressure line from the tank no return line.
I had a Chev Corsica with V6. The fuel lines that ran straight fore and aft to/from fuel tank were metal. But where comes out of tank it was rubber. I'm assuming you've developed a pinhole leak in one of the metal fuel lines. I would suggest putting a "sleeve" of neoprene fuel line over the leak and clamp in place. This requires cutting the neoprene hose lengthwise so that you can slip it over the bad spot. Jut keep in mind that these fuel lines are under a bit of pressure.
Instructions 1 Locate the fuel filter on your carbureted engine by first raising and supporting the hood. Both carbureted and fuel injected fuel filters look the same. The filter resembles a metal canister that measures 5 to 6 inches. The fuel filter in the carbureted Ram 50 sits on the driver's side of the engine, back against the firewall. The filter's fuel lines mount on the bottom and top of it. The bottom line is held in place by a nut. The top line mounts to the filter with a banjo-bolt. (You can remove the fuel filter with a socket wrench and an adjustable wrench. Place a shop towel under the filter to soak up any fuel that may spill.) 2 Locate the fuel-injected engine's fuel filter by first applying the Ram 50's emergency brake. Raise the truck forward of the rear driver's-side tire with a hydraulic jack. Set a jack stand 3 inches from the hydraulic jack beneath the frame rail. 3 Slide under the truck near the gas tank. Right where the frame rail ends, just in front of the gas tank, you should see the fuel filter. It's the same size and shape of the carbureted fuel filter. The one difference is both of the fuel lines mount on top of the fuel injected filter. (To remove this fuel filter, loosen the hose clamps on the fuel lines with a Phillips screwdriver. Before you pull the hoses off the filter, set a metal catch pan beneath it to allow the fuel in the lines to drip into it.) Thanks
If you have disconnected the fuel filter (inlet) side and turned on the ignition, if fuel is not coming out of this line, then there is a fuel pump problem. This is assuming that you can hear the fuel pump actually running. Usually when the fuel pump runs and you can hear it, then there can be a screen on the pump plugged or the pump its self is not working. Hope this helps.
It's along the fuel injector rails. With the engine not running the fuel line primed should read 55psi and 46psi with the engine idling and the manifold vacuum applied for the 3.3 liter. With the engine not running the fuel line primed should read 48psi and 39 psi with the engine running and the manifold vacuum applied for the 3.5 liter. Good luck and hope this helps.
There are six fuse panels for an E39 BMW Fuses
F1 - F45, fuse panel 1, glove compartment. Twist white plastic
retainers 90 degrees and pull down from top of glove compartment. Fuse 31 (10 amp) protects fuel pump relay(K96)
F46 - F6, fuse panel 2, trunk located behind right side luggage compartment interior panel. Fuse 54 (15 amp) protects fuel pump relay(K96)
Before I would do any of the following, I would check the above fuses and put a bottle of HEET into the fuel tank. Fuel filter changing is not hard, but it will take you about an hour. The fuel pump is another story (BMW has a special spanner wrench(16 1 020) to remove and install the threaded collar.
E39 BMW use a two-lobed fuel tank(think saddle bag like). Each with its own fuel level sending unit that has a float connected to a variable resistance wiper contact. To equalize fuel level between the two tank lobes, a siphon pump is installed in the left lobe. The resistances need to be approximately the same. The fuel pump is on the right lobe under the tank sending unit beneath the threaded collar at the top of the fuel tank which is accessed by removing the rear seat cushion. WARNING When removing the fuel level sender or the fuel pump, the fuel tank should be drained to 1/4 capacity or below. The fuel in the fuel line is under pressure (45-75 psi). Always unscrew the fuel tank cap to release pressure in the tank before working on the tank or lines. Disconnect battery negative cable.
The fuel filter is located beneath the center of the car near the driver's seat usually under a protective metal cover held on by small screws. Not hard to replace but car will need to be on jack stands and 1/4 tank or less of fuel in the tank. Definitely wear safety goggles or face shield as the fuel will come out on face. Have a fuel catch pan under the filter. Clamp the fuel line before and after the fuel filter(long metal cylinder) before loosening hose clamps. Loosen center clamping bracket and hose clamps on either end of filter. [Some have an inline fuel pressure regulator.(Remove vacuum hose, pull out locking clip, remove fuel pressure regulator).] Drain fuel from inlet side of filter and check fuel for rust moisture or other contaminats. Installation is reverse. When installing fuel filter, ensure fuel flow direction arrow points to front. Should have at least 5 liters of fuel in tank before restarting. The fuel pump will be damaged if run without fuel. PT Stanley