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  1. C

    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    funky so I do leave since usage was limited, the addition of fresh gas each year was not enough to overcome the original gas in the tanks. tanks are 173 capacity with about 12 gallons of "unusable gas" per (Ocean techs) gives me 158 gallons without running dry. (per tank)
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    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    The color of the gas per our marina operator could be aged gasoline and/ or the additives even though I add at least 60-80 gallons which filled the tanks to over 3/4 every year at the end of the season since use of the boat was limited. I'm still wonder if last top-off last year (2024) I got a...
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    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    Port Engine first: We relocated pump and both filters on a plate near the back and bottom of the tank onto the stringers. Tank supply line from the "anti-syphon" fitting now much shorter and directly to the primary gas water separator filter. High pressure line goes directly from secondary...
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    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    To answer, spray pattern seems good. I have been questioning the quality of the gas causing my engine staring issues. Finally had a chance to do a visual comparison. Information on what I see as follows: Note in December 2024 I put approximately 70 gallons in each tank gas ( tanks are 173 gallon...
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    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    I ran the boat 1hour and 45 minutes and for 5 minutes at 3820 RPM at 18knotts then slow down to an idle for several minutes without stalling (which they have never done), so if there is a fuel restriction when hot, why are the engines still running which drives me crazy?!
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    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    The starboard engine doesn't have anti-syphon, the two check valves were additional but on the port engine they were removed and this side tank has an new anti-syphon valve. I'll recheck the vacuum gauge installation.
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    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    Update, vacuum gauge installed and no reading at anytime or "no idle on hot shutdown". Trip on the bay ran engines up to 3820 RPM at 18.3 knots for 10 minutes without hesitation, slow down to idle back to slip for 12 minutes. Total run 1:45 minutes, Engines performance are great. Once at slip...
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    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    We've been at this problem for several years and just can't find a system problem after exhausting every possibility including switching the tanks with crossover lines. We are curranty designing and relocating a new fuel delivery system with the appropriate marine approved lines utilizing the...
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    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    I've been on a weather delay for testing. My filters were cut open and are clean, no signs of debris or water. Gas color is more "amber" than clear which I assume is the additives that "Valve-Tect" marine gas uses. The question then, could the additive too high of concentration causing boiling...
  10. C

    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    Thank you for your help, that eliminates some of my potential alternatives or causes. Will go ahead and revisit the vacuum gauge. I may have to move the filter and bracket from its location to get access for the gauge without disturbing any fuel lines.
  11. C

    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    No CEL, (we believe problem is not electrical ), gas pumps are mounted on a bracket on the front face of the cylinder head, filter is on the side of head in front and close to the exhaust manifolds, and location is at about half tank level. not in tank. ECT sensors replaced and with no...
  12. C

    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    Finally got the sea-trial (90 minutes) run and test done and back to the slip and ether engine would start. No CEL on ether engine and installed the "Timing Light" and spark was great. I had installed my pressure test gauge which has a "push button" pressure relief valve" I had no gas and very...
  13. C

    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    The Starboard tank we have limited access to the top (Port tank is buried so we based condition as the same as Starboard) and overall we did not see any debris other than a little water which I would except. At about 1/4 tank of gas (160 gallon capacity each), the pickup tube for what we could...
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    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    Thanks, that is why I started to research the Crusader numbers to convert to OEM numbers or a quality aftermarkets but as you know prices and availability have gone crazy for these older engines (and everything else). My 50+ years in diesel parts helps with this task! We have check pressure...
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    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    Weird is an understatement! We purchased the boat in 2009 and with no starting problems till 2022 so its Just driving us crazy! I appreciate your comments on the abuse and there are some people that are hammer and vise-gripe "so called" mechanics. I am a stickler with anything I do and use only...
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    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    OK I should have known and they do have them on the pigtail interphase socket and they have been off yet its worth another look. Thank You!
  17. C

    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    I have the Diacom Dynamistic program for these models and running engine data look normal and no codes. I did found the GM number on the ECU back. You mentioned CEL, What is CEL?
  18. C

    Crusader 1996 454XLT Hot start problems (ECUs issue?}

    I have two 1996 454XLT with throttle bodies with engines under 30 hours and both will start but will not idle or stay running after I run the boat for 1 to 2 hours. Both ack like they have gas supple issue, but when running the pumps are at the required 18-20 pressure, GPH and are Crusader...
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