martin
Well-Known Member
- Joined
- Aug 6, 2007
- Messages
- 3,218
- Age
- 78
- City
- St Bruno, Quebec
- Vehicle Year
- 1984
1991
- Transmission
- Manual
Is there a test port on a 91 4 liter? If there is, where is it? If not, how on earth do you check the fuel pressure?
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Watch out for fuel spray when you screw it on do it quick. Check it at an idle with and without the vacuum on the regulator then run it at 2000 rpm and goose it to WOT for a few seconds. Then turn the engine off and watch for pressure drop time it. If the pressure drops quick, Turn the key on let the pump cycle without starting it and note the pressure and the drop. Get back with the results.