 Convert back to D Jet Fuel Injection-, MPS electric issues |
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| young55961 |
 Jun 8 2026, 09:42 AM
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#1
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Newbie  Group: Members Posts: 26 Joined: 15-March 18 From: Arcadia Member No.: 21,972 Region Association: Southern California  |
Hi there,
I purchased a D jet kit a few years back thinking convert my dual carb back to fuel injection. I begin to inspect the parts I received. First the MPS. 1. Pressure is good holding at 15 PSI 2. Outer Terminal(7, 15) : 94 3. Inner Terminal(8, 10) : "OL". What does the outer and inner terminal control ? Can it be fix ? Tks. |
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| JeffBowlsby |
Jun 8 2026, 11:11 AM
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#2
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 9,260 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None 
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15 PSI is probably OK if it remains steady. A steady 18 PSI is recommended.
The inner two and outer two terminals are contacts for the two coils. You should see a resistance between the outer two terminals of around ~350 ohms. If not, the problem could simply be a bad internal coil connection or the coil may be defective. The back half of the MPS can be exchanged with a known good part, requires disassembly. I may have one to swap, but you will need to send me the MPS for the repair or swap. |
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| young55961 |
Jun 8 2026, 01:41 PM
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#3
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Newbie Group: Members Posts: 26 Joined: 15-March 18 From: Arcadia Member No.: 21,972 Region Association: Southern California |
QUOTE(JeffBowlsby @ Jun 8 2026, 12:11 PM)  15 PSI is probably OK if it remains steady. A steady 18 PSI is recommended. The inner two and outer two terminals are contacts for the two coils. You should see a resistance between the outer two terminals of around ~350 ohms. If not, the problem could simply be a bad internal coil connection or the coil may be defective. The back half of the MPS can be exchanged with a known good part, requires disassembly. I may have one to swap, but you will need to send me the MPS for the repair or swap. I want to know if a bad MPS can prevent the engine from firing up, or if it would only cause the engine to run too rich or too lean. I want to put everything back together first to see if the engine will run before spending more money replacing components. |
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