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Thread: No power to Fuel Pump Fuse or fuel pressure

  1. #1
    Join Date
    Jul 2018
    Location
    La Crosse, WI
    Posts
    3
    My Cars
    1998 BMW 328i

    No power to Fuel Pump Fuse or fuel pressure

    I drove my '98 BMW 328i from work fine, but next time I tried to start it, it would crank, but it wouldn't start. I checked the injectors, and I wasn't getting pressure, so I've replaced both the Fuel Pump and the Fuel Pump Relay.
    I've also examined the DME, and it looks to be in fine condition.
    The fuse (#18) looks fine and has continuity, but it doesn't receive any power. I'm not sure what I should be looking for to see what's causing this. It's my daily driver, so I'd like to get this fixed soon.

  2. #2
    Join Date
    Jun 2010
    Location
    NY
    Posts
    9,079
    My Cars
    1997 328i
    What's up Harvey, welcome to the forum!

    Great diagnostic work so far. You've 99% confirmed your Cam sensor is bad. It's important to get an OEM part for this, Siemens/VDO are OEM'ers for this part.

    There are few places to buy one but the cheapest I've found is an ebay seller that does high volume, you can use the 800 number to order from them directly. You can also ask for a better price, but do that in the beginning of the conversation. Reference the ebay auction number and get them to verbally verify that it's the VDO part.

    Just for future reference, cam sensor controls fuel, crank sensor controls spark.

    https://www.ebay.com/itm/For-BMW-323...O/351443945643
    Last edited by Eric93se; 03-24-2019 at 05:39 PM.
    Attn. NEWBIES: Use the search feature, 98% has already been discussed.
    Click the search button, select "search single content type", select the "e36 sub forum" specifically, try the "search titles" then try the "search entire posts".

  3. #3
    Join Date
    Jul 2018
    Location
    La Crosse, WI
    Posts
    3
    My Cars
    1998 BMW 328i
    My car isn't throwing any codes at all. Would a bad cam sensor not throw one? Also, are there any other possible causes I should look into?

  4. #4
    Join Date
    Jan 2019
    Location
    HK
    Posts
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    My Cars
    525
    Harvey, jump your fuel pump relay with a wire, and see if fuel flows to the rail, and current flows through your fuel pump fuse. Then check your crank sensor's resistance and confirm that it is within range (please google for the resistance info).

  5. #5
    Join Date
    Jul 2018
    Location
    La Crosse, WI
    Posts
    3
    My Cars
    1998 BMW 328i
    I'm just learning automotive work with Harvey (my car). Can you link an article on how to safely jump the relay?

  6. #6
    Join Date
    Jan 2019
    Location
    HK
    Posts
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    My Cars
    525
    Please check on youtube and google. This issue is covered in many places.

  7. #7
    Join Date
    Jun 2007
    Location
    Wisconsin
    Posts
    11,751
    My Cars
    98 328IS 03 325xi
    Bad sensors wouldn't cut off power to the fuel pump unless the EWS system does that. Try applying power directly to the fuel pump to see if it will start.

    Gave away my BMWs, driving a VW and an Audi now.

  8. #8
    Join Date
    Jan 2019
    Location
    HK
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    525
    Quote Originally Posted by jmo69 View Post
    Bad sensors wouldn't cut off power to the fuel pump unless the EWS system does that. Try applying power directly to the fuel pump to see if it will start.
    jumping the relay will do exactly that.

  9. #9
    Join Date
    Sep 2018
    Location
    KwaZulu Natal, S. Africa
    Posts
    11
    My Cars
    E30 325i and E34 525i
    Try and clean the sensor. Maybe it just got a bit of dirt stuck in it.

  10. #10
    Join Date
    Jun 2007
    Location
    Wisconsin
    Posts
    11,751
    My Cars
    98 328IS 03 325xi
    Quote Originally Posted by DANLOBO View Post
    Try and clean the sensor. Maybe it just got a bit of dirt stuck in it.
    What sensor supplies power to the fuel pump? None that I know of. Cam sensor fires the injectors.

    Sent from my SM-G950U using Tapatalk

    Gave away my BMWs, driving a VW and an Audi now.

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