Fuel Pressure Problem - seeking advice on fuel pressure regulator
The fuel pump is relatively new and when running, the fuel pressure is good (50 psi plus).
However, when the engine is shut off, the rail pressure drops way off. It requires a lot of cranking to get the pressure back up when starting the engine.
There doesn't appear to be any leak in the fuel line between the fuel pump and the fuel rail.
I am reluctant to install another fuel pump (new $300) on a vehicle this old.
YOU HAVE TO CRANK IT TO GET THE FUEL PRESSURE UP?? A FUEL FILTER WILL ALSO GIVE YOU THE PRESSURE BUT NO VOLUME...
Check the fuel pressure regulator.
Best to have it tested first.
it sounds like it could be the the fuel regulater
I have the same problem on a 99 other Voyagers show it on the engine on the rail I don't see it. I see a plastic thing down below with a vacuum line going to the engine and what appears to be a line going back to the gas tank but that is not what I've seen on videos of other caravan/voyagers
Kind of late but our 1995 3.0 started doing this also. Cycling the key to build pressure before starting did not help. I think when the pressure bleeds off and fuel drains back toward the gas tank it draws air through the injectors into the fuel system and even if you cycle the key to build pressure, you still have to crank the engine until the air is gone and fuel is being injected into the heads. After living with it for awhile I bought a small brass check valve and two barb fittings and put it in the rubber fuel line that connects the in tank fuel pump to the steel fuel line. It has worked for 3 or 4 years and I didn't have to pull the pump.
I had the same problem w/ my 1995 Caravan V6. I installed a cheap (Chinese) check valve in the rubber fuel supply line just upstream from the fuel rail. I'll see if it works this coming week. The question I have is: how do you "check" the fuel pressure regulator? It is apparently a big job to change it since the plenum has to come off, and a lot of parts have to come off just to do that from what I can see.
I'm not sure how your would check the fuel pressure regulator or even fuel pressure if yours is a 3 liter V6 like mine. There is no schrader valve to connect a fuel pressure gage. I've had several of these vans and have never changed one before but have had the plenum, intake, and heads off before to do head gaskets. The plenum isn't too difficult to take off really. Most of the work is unplugging sensors and cables on the throttle body. Once the plenum is off the fuel pressure regulator, fuel rail, and injectors and harness are all easily accessible.
Oh, one other thing I forgot. If you do pull the plenum there is an EGR tube that goes from the throttle body to the rear exhaust manifold that can sometimes be a pain to remove.
