lummert
Active member
- Joined
- Jan 11, 2008
- Location
- Portland IN
My 88 765 Turbo has a hot start problem. I've run fuel pressure tests (after installing a schrader valve) using 5 different fuel pressure regulators each with the same result. Fuel pressure immediately drops to zero as soon as engine is shut off.
I pulled the pump and swapped in different check valve. No change in symptom. Car seems to smell like gas most of the time. Sometimes the exhaust smokes like burning oil, but doesn't smell like burning oil, then it just clears up. My gas mileage around town suffers, probably related to the hot restart problem. On the highway the mileage is somewhat better, average is about 19-20 mpg.
My next step is to pull and check the spark plugs.
This is how I installed a Schrader valve on the fuel rail: I sawed off the fuel fitting that accepts the fuel supply line from fuel filter. I polished the cut 8mm fuel line with a strip of emery cloth. I installed a 5/16" compression fitting (the hole in the compression nut needs to be reamed out to fit the tube, but the ferrule fits the 8mm line) to 1/8 male pipe threads into a 1/8" female pipe thread Tee. Then drilled and tapped the the cut off fuel fitting with 1/8" female pipe threads. Installed compression fitting into on end of tee. Installed the fuel fitting in other end of tee. Installed A/C R12 type Schrader valve with 1/8' male pipe threads threads into the top of the tee. Tightened everything down and tested for leaks. Connected fuel pressure tester, no leaks.
I pulled the pump and swapped in different check valve. No change in symptom. Car seems to smell like gas most of the time. Sometimes the exhaust smokes like burning oil, but doesn't smell like burning oil, then it just clears up. My gas mileage around town suffers, probably related to the hot restart problem. On the highway the mileage is somewhat better, average is about 19-20 mpg.
My next step is to pull and check the spark plugs.
This is how I installed a Schrader valve on the fuel rail: I sawed off the fuel fitting that accepts the fuel supply line from fuel filter. I polished the cut 8mm fuel line with a strip of emery cloth. I installed a 5/16" compression fitting (the hole in the compression nut needs to be reamed out to fit the tube, but the ferrule fits the 8mm line) to 1/8 male pipe threads into a 1/8" female pipe thread Tee. Then drilled and tapped the the cut off fuel fitting with 1/8" female pipe threads. Installed compression fitting into on end of tee. Installed the fuel fitting in other end of tee. Installed A/C R12 type Schrader valve with 1/8' male pipe threads threads into the top of the tee. Tightened everything down and tested for leaks. Connected fuel pressure tester, no leaks.
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