Subject	Lets Talk about the Basics.
Posted by	Cjw3 on May 23, 2024 at 8:35 AM
	This message has been viewed 160 times.
In Reply To	Base Fuel Pressure Issue: Walbro 485 and Tomei FPR posted by komplexZTT on May 23, 2024 at 07:20 AM
Message	The Fuel Pressure Regulator, is actually a Pressure Relief Valve.. All the Fuel that is needed to lower the High Side pressure, must be able to get back to the Tank with Minimum Flow Restrictions.. [ Side Note ] In the Case of the '90s Cars, the 'Pressure Relief Valve' is referenced to Manifold Pressure , so the Fuel Injector has a constant Pressure Drop it has to deal with. Could it be that the return side lines are too small, not letting enough fuel back to the tank, at an unrestricted rate? I'm wondering if you might have a 'Twist' in a Return line, or an Underbody Ding that might have dented the Fuel Return Line? My guess is put a fuel pressure gauge in the return line, before it dives back under the car from the engine compartment, and have a look at what your return line pressure is.. I've never done that, but my Guess is, if your over a few PSI, it too much, as that pressure should be additive to the High Side Pressure. Cj
Follow Ups	Base Fuel Pressure Issue: Walbro 485 and Tomei FPR - komplexZTT 07:20:31 05/23/24 Lets Talk about the Basics. - Cjw3 08:35:03 05/23/24 thanks for the input! - komplexZTT 08:41:28 05/23/24 visual inspection on hard lines look ok - komplexZTT 17:17:34 05/25/24 return line test results>> - komplexZTT 09:24:40 05/30/24 pressure gauge cause issues? - komplexZTT 08:21:20 05/30/24 Have you looked at the pump yet? - zwzweston 14:55:37 06/08/24 I did replace the strainer - komplexZTT 06:56:06 06/11/24
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