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  1. #1

    Default Crusader 454 1989 runs for 5 seconds then quits.

    My starboard engine starts and runs only about 5-7 sec. before shutting down. The oil pressure sending sensor was replaced last year. I'm showing good oil pressure, could I have a choke stuck or float stuck? Any ideas??? Also, what carb does it use or how to identify?
    Last edited by sailawaysg; 06-25-2019 at 09:28 AM. Reason: info

  2. #2

    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    Check your fuel pressure/fuel filter. Carb should be a Rochester Q-Jet, should run off of approximately 8-10psi.

  3. #3
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    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    2X on the qjet - qjets are unique - the internet is your biggest source of free informati

    they operate best with 4-6 psi....most won't handle 8PSI very well.

    will it restart right away??? what's coming out of the exhaust?

    flooding are usually easy to detect with your nose.....is there any fuel in the sight tube?

  4. #4

    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    Quote Originally Posted by makomark View Post
    2X on the qjet - qjets are unique - the internet is your biggest source of free informati

    they operate best with 4-6 psi....most won't handle 8PSI very well.

    will it restart right away??? what's coming out of the exhaust?

    flooding are usually easy to detect with your nose.....is there any fuel in the sight tube?
    It will not restart right away. I do smell a slight gas smell from the exhaust making me think it could be a stuck choke or float. It's hard to do with one person. As for sight tube I don't see one in there.

  5. #5
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    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    Quote Originally Posted by sailawaysg View Post
    ...... As for sight tube I don't see one in there.
    That's not good - the sight tube is the yellow tygon tube that runs from the front of the carb down to the fuel pump....as it ages, it will become brown and inflexible. Its purpose is to dump any fuel from a ruptured diaphragm into the carb (vs letting it fill the bilge with gasoline)….

    most big blocks, w/ qjets, suffer from 'nozzle drip' at idle and have a tendency to run a bit rich from it. a stuck choke or a bad float will usually cause an easy to observe flooding condition...when it quits, pull the flame arrestor and see if the top of the carb is wet, especially around its perimeter....

  6. #6

    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    OK. I'm going to check on it shortly. Thanks!

  7. #7

    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    I think I may have a wiring connection problem with the oil pressure shut off switch. One is N/O, N/C & C. One has a fuse inline which is good but the rest of that wire is suspect. I just thought of this and wonder what I should read on the 3 conn. with a meter?

  8. #8
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    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    you should have a mechanical pump on an 89 block....has the block been swapped for something newer?

  9. #9
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    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    Do you still have the Mallory distributor with the points inside?

  10. #10

    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    The way your system is wired, while the starter is cranking the fuel pump is receiving voltage to start the engine. As soon as the oil pressure comes up line voltage is directed to the pump to keep the engine running. Sounds like your pump is running during the start cycle but drops off when you come off the starter. Oil pressure switches are very problematic. Recommend you monitor voltage going to the pump immediately after the engine starts. Best place to connect you multimeter is at the fuel pump circuit breaker. Good Luck.

  11. #11

    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    Thanks!

  12. #12

    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    I believe the engine was swapped. I see the pressure sensor and 3 wires. 1 looks like it goes to the fuel pump (electric).

  13. #13

    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    One wire goes to the pump, one wire goes to the ignition switch starter circuit, and the last wire is battery/alternator voltage. At rest, the pump and ignition wire are spring-loaded closed. When oil pressure comes up, the pump wire is disconnected from the ignition source and connected to the battery wire. I had a new pressure switch fail in six months ($110 - ouch). They are famous for poor reliability. Might ensure that the battery voltage wire is hot at the pressure switch with the ignition switch on.

  14. #14
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    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    The NC side of the switch controlling the fuel pump is usually connected to the START side of the ignition switch . the fuel pump is engaged when the starter is active.....making that conection from the switch to the IGN lead would defeat the intended 'safety feature' of using the oil pressure controlled switch...

    And, wih the update that this really isn't a markIV block, you can debug the fuel pump partially by just bypassing the control circuit using a fused jumper to control the pump. if that keep the engine running, then you need to figure out what has gone bad in the control circuit that was implemented when the block was swapped.
    Last edited by makomark; 07-01-2019 at 09:41 AM.

  15. #15

    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    Update: No gas to carb. now. Ran out of gas and put 30 gals. in 300 gal. tank. Do I need to prime the electric fuel pump? Could the breaker be tripped? I'm at a loss...

  16. #16
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    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    does the fuel pump run if you jump it to battery voltage?

  17. #17

    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    If wired correctly and working -- put the trans in gear and turn the key to start. The fuel pump should run to prime the system without the starter running.

  18. #18
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    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    I think that will only work with the MEFI controller on the injected models.....the carb/electric fuel pump wiring is different....

  19. #19

    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    Works all the time with electric fuel pump/carbed engines. Just need to be sure the neutral safety switch is functional to avoid starting in gear.

  20. #20

    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    Quote Originally Posted by Mulletwagon View Post
    Works all the time with electric fuel pump/carbed engines. Just need to be sure the neutral safety switch is functional to avoid starting in gear.
    I'm going to try that this morning. Thanks

  21. #21

    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    PROBLEM(s) SOLVED!!! Bad fuel pump AND points...

  22. #22
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    Default Re: Crusader 454 1989 runs for 5 seconds then quits.

    glad you're running again...

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