MarineEngine.com - Your online store for all types of marine engines and boat parts.
PHONE ORDERS
Monday - Friday
9:00 AM - 5:00 PM EST
Click for TOLL-FREE Number
Online Checkout
Special $9.95 Flat Rate Shipping
(800) 209-9624 | Home | Contact | Shipping | Returns | Cart View your shopping cart.
Part Number Search
Shop by engine/drive part number.
Original & matching parts for sale.
Manuals & Accessories
Shop by description, item number
or manufacturer's model number.
Boat Repair Forum Boat Repair Forum   Boat Video Gallery Video Gallery
   
Results 1 to 3 of 3
  1. #1

    Default Marine Power 7.4 Liter will not stay running.

    Twin model S7.4V (GM 454) engines approximately 9 years old. Starboard engine starts and runs great. Port engine starts then stumbles and stalls. If you spray a little starting fluid into the air box, the engine will pickup and smooth right out. It seems like after the initial start, the engine may run out of fuel and stall. There is fuel in the tanks, and the filters have been changed. Maybe there is a permissive for the high pressure injector pump after initial 3 second initial start pump sequence, but I cannot find any literature to tell me if this is true.

  2. #2
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    5,581

    Default Re: Marine Power 7.4 Liter will not stay running.

    follow the wires from the fuel pump back into the harness. One of the leads should go to the oil pressure safety switch. They are known to fail frequently. if you find the switch, check it with a test light to see if it passes current to the pump with the engine running. If not, you can bypass the switch with a jumper lead to verify it has failed (open). Once verified, you can replace it.

    If it turns out to be the switch, buy at least one spare - the other side probably got its switch from the same batch.

  3. #3
    Join Date
    Jul 2011
    Location
    east tennessee
    Posts
    9

    Default Re: Marine Power 7.4 Liter will not stay running.

    quadrajet carbs are known to be leakers . after a while of sitting they just loose all the fuel out of the floatbowels and then when ya go to start them they fire up initally and then die - and until they get enough fuel pumped back into the carb they will run rough as a cob . a rebuild is one answer but the q-jet will do it again ; especially if the engine sits a lot - another good reason to go with fuel injection .

Similar Threads

  1. 1995 Marine Power 454's running rich
    By Nick Nicholson in forum Marine Power Engine Forum
    Replies: 9
    Last Post: 01-15-2011, 10:58 PM
  2. 3.7 Won't stay running
    By SeaSprite195 in forum Mercruiser Sterndrive Forum
    Replies: 36
    Last Post: 08-09-2010, 11:44 PM
  3. Won%60t stay running
    By tobyc207 in forum Johnson Evinrude Outboard Archive
    Replies: 4
    Last Post: 09-05-2009, 10:28 AM
  4. DF115 will not stay running
    By DiggsNWT in forum Suzuki Outboard Archive
    Replies: 7
    Last Post: 07-24-2008, 12:50 AM
  5. WONT STAY RUNNING
    By stevewat in forum Mercruiser Sterndrive Archive
    Replies: 4
    Last Post: 10-20-2007, 04:31 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •