308 QV has difficulty starting uphill | FerrariChat

308 QV has difficulty starting uphill

Discussion in '308/328' started by SaratogaCA, Jan 20, 2018.

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  1. SaratogaCA

    SaratogaCA Formula Junior

    Sep 11, 2016
    319
    Saratoga, CA
    Full Name:
    Sam T.
    Three times, my 83 308 QV failed to start after I parked it facing uphill. Each time, the car cranked fine, but would not start.

    First time, the fuel pump fuse burned out. After replacing the fuse, it started fine.

    Second time, on a nearly empty tank, I rolled the car back into level, and it started

    Third time, on a full tank, I rolled the car facing downhill. It did not start. Came back 10 minutes later, and it started.

    My theory is some sort of fuel starvation. I have zero mechanical skills, but I pored over the fuel system diagram from Ricambi. I think the critical portion of the fuel delivery system consists of two fuel tanks (38 and 39), with the Left Hand or driver side tank (39) having a filter (48) that feeds a hose (23) that connects to a fuel pump (1), which, through a check valve (17) feeds fuel to another hose (22) which goes into an accumulator (7), and from there, through another hose (28) into a filter (31) and from there, through another tube (21) to a metering device (not shown).

    For some reason, pointing the car uphill apparently drains fuel out somewhere, and puts pressure on the fuel pump.

    Your thoughts or feedback would be appreciated.


    - Sam in Saratoga Image Unavailable, Please Login
     
  2. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    12,661
    San Carlos, CA
    Full Name:
    Mitchell Le
    Old fuel pump. When was the last time you had the fuel system serviced? What are the conditions of your fuel vent lines?

    The next time it happens, someone should immediately do a system fuel pressure test.
     
  3. waymar

    waymar Formula 3

    Sep 2, 2008
    1,321
    Northeast, PA - USA
    Full Name:
    Wayne Martin
    Fuel system pressures check is in order. Could be the accumulator.
     
  4. mike996

    mike996 F1 Veteran

    Jun 14, 2008
    6,685
    Full Name:
    Mike 996
    Pull the connector from the fuel pump safety switch and see if there is any change to the non-starting on hills.
     
  5. SaratogaCA

    SaratogaCA Formula Junior

    Sep 11, 2016
    319
    Saratoga, CA
    Full Name:
    Sam T.

    Actually, I don't know, but you had the car on a lift a while ago. Do you happen to recall?

    Anyway, I've got a full tank of gas. When I exhaust the tank, I will try to coordinate a time to come to your place so you can take a look ... and we can have a beer and a burger as well. Been too long!


    - Sam in Saratoga
     

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