Question about 1986 BMW 3 Series

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Fuel pump getting power but not to injectors

I checked the line directly from the pump "ok' but I'm not getting fuel to the injector rail; I can't determine whether its the fuel filter or the relay switch.

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Verify TDC sensor

Posted on Sep 03, 2009

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I have a 95 chevy silverado with a 350. i have fuel to the trottlebody but not the injecters. why?


It seems like the fuel line may be plumbed up to the wrong place. The throttle body only regulates airflow. Check that the fuel line is plumbed up to the fuel rail, which feeds the injectors. There should also be a return fuel line from the fuel rail back to the fuel tank.

Jun 18, 2014 | 1999 Chevrolet Silverado 1500

1 Answer

2004 ford explorer will not start but turns over


For a no start , cranks over ok. be sure you have fuel pressure at the fuel rail first, before checking the injectors. There should be more that 40 psi at the rail... if not .. you might have a fuel pump problem. Even if you have fuel pressure at the fuel rail... the next thing I would check for,,, is spark !! Make sure you have spark at the spark plugs. The order would be... fuel pressure first and then spark , , then injector pulse. !! Then plugged exhaust.... then bad fuel then engine timing. The injectors have power to them all the time. The PCM controls the ground to the injectors. So you would have to monitor the ground side of the injectors. So checking injectors is kinda complicated. Hope this helps you. Good luck.

Mar 03, 2013 | 2004 Ford Explorer

1 Answer

Not getting fuel to no. 2 injector and no. 3 injector but one and four has plenty


i would check the wiring to tthe injectors first see if there is power getting to injectors then i would look at replacing them are they individual injectors or a rail type i think they are rail type if so the wiring or injector goosed as the fuel runs along the rail and the injector opens when the signal gets to it if you get what i mean hope this makes sence and helps ivan

Oct 17, 2012 | 1986 Volkswagen Cabriolet

1 Answer

New fuel pump still no fuel


lets say you have power and fuel is pumping it goes from pump to fuel rails in one long line if fuel is at port on rail then ck injectors for hot and ground hot with key on ground with engine turning injectors get ground from ecm ,if no ground ck for bad ground wires then ck ecm ,. if no power to pump ck fuse and fuel pump relay and wire system. some times replacement parts are bad.

Jul 29, 2012 | 1993 Lincoln Town Car

1 Answer

No signal to fuel pump or injecters


Pressure in the rail indicates the pump is working.
When the key is turned on, the pump will come on for about 2 seconds to pressurize the fuel system. Then pump will shut off and not come on again until the engine is cranked. When cranked or when running, the pump will be on full time. To check if the pump is getting a signal, the engine must be cranking over. Or you may pick up that 1 or 2 second signal when the key is first turned to on. Is this the way you checked for power to the pump? How much pressure are you getting at the rail? Any pressure at all means the pump put it there.
Injector circuit test: Use a testlight and ground it to the engine. Pull off an injector connector and turn key to on. Probe the two wires to the injector. One wire should have power and light the testlight. If it does, the power side to injector is good. If nothing there, the injector drive circuit is out.
If you got a steady light on one wire, then check the injector ground circuit. Move the testlight lead from ground to the positive battery post. Now probe the injector connector's wire that did not light the testlight, while someone cranks the car over. If working right, the testlight should now be blinking, meaning the computer is properly grounding the circuit for injector to pulse. If both tests pass, the injector circuit is working right.
Good luck.

Jun 26, 2012 | 1990 Nissan 300ZX

2 Answers

I need to access the fuel injectors in my 98 wrangler, but i dont know how to get to them


FIRST NEED TO RELIEF FUEL PRESSURE REMOVE GAS CAP RELIEF GAS PRESSURE IN FUEL TANK.THEN REMOVE FUEL PUMP RELAY THEN START ENGINE UNTIL IT DIES LACK OF FUEL,CRANK ENGINE OVER FEW MORE TIMES MAKE SURE FUEL OUT OF FUEL LINES. THEN YOU NEED TO REMOVE AIR CLEANER CROSS OVER TUBE ABOVE FUEL RAILS. DISCONNECT LINES AT THE ENDS OF THE FUELS RAILS ASSEMBLY. MARK AND DISCONNECT THE FUEL INJECTOR WIRE HARNESS CONNECTORS. REMOVE THE FUEL RAIL RETAINING BOLTS, DISCONNECT THE VACUUM LINE FROM THE FUEL PRESSURE REGULATOR. REMOVE THE FUEL RAIL ASSEMBLY FROM THE ENGINE. IF YOU HAVE AUTOMATIC TRANSMISSION REMOVE THE THROTTLE PRESSURE CABLE AND BRACKET TO REMOVE THE FUEL RAIL ASSEMBLY.TO REMOVE FUEL INJECTORS JUST REMOVE CLIPS THAT RETAIN FUEL INJECTORS IN FUEL RAIL. BESURE GO TO DEALERSHIP BUY NEW FUEL INJECTORS O - RINGS.APPLY A SMALL AMOUNT OF ENGINE OIL TO THE O - RINGS TO AID IN INSTALLATION. TORQUE FUEL RAIL BOLTS TO 100 INCH LBS.

Jun 19, 2011 | 1998 Jeep Wrangler

1 Answer

We can not understand why it cant get fuel to the injectors


Have you tested out the fuel pump? check for plugged fuel filter?
plugged fuel lines to the fuel rail, injection pulse at the injectors? power to the fuel pump relay? grounds needed to make certain systems work must check those also. get a wiring diagram of the fuel supply system and back trace all the wiring and see if you have power and ground and signal.

Aug 28, 2010 | 1986 Cadillac DeVille

2 Answers

After removing the fuel injectors and rail to remove the manifold, how do you reinstall the fuel injectors?


the same way you took it apart. put a little grease around the rubber seals so they will slide in easier. just tap on the fuel rail while lightly tapping it into place.

Mar 28, 2010 | 2002 Honda Passport

1 Answer

No fuel pressure in injectors


If the fuel preessure reg. is on the fuel rail after the injectors before the return line and is clogged fuel pressure will be higher than specs.but will be in the fuel rail.If reg. is before the injectors(as in at the beginning of the fuel rail) and it is clogged then there probably wont be any fuel in the line. I beleive the injectors may be the point of concern.Check the injector fuses first.

Sep 22, 2009 | 1992 Dodge Caravan

1 Answer

Injector control pressure sensor circuit low


I can't remember that year exactly so help me out it's been a while
is that a IDI diesel that has a injector pump sitting in top center front of engine (has all the fuel lines running off it) or is it a Direct inject engine that has the injectors all comming off a central fuel rail

IDI diesel = sensor is on pump front lower under cold throttle kicker coil

direct inject= sensor is on driver side at end of fuel rail toward fire wall

Apr 01, 2009 | 2003 Ford F350 Super Duty DRW SuperCab

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