1990 b150 ram van 5.2

[benjaminjb]

Low fuel pressure.

With fuel pressure reg hose off.
14psi

With fuel pressure reg hose on reads 8-9 psi. Engine slowly shuts off.

When driven with fuel pressure reg hose on or off, van runs like no power. Like a Honda 1.5 liter trying to push a van. Louzzzyy

13-14 volts to pump. Yes.green wire. Blue 6 volts

Asd tested passed. Green wire on when engine is on. Off when key forward engine not started.

Tried direct power from batt 13-14 volts running. Green wire.

Replaced fuel pressure reg
Psi. Went from 6to9 with new regulator.

Coil good. Tune up done oil change. Wires n plugs. Cap n rotor, good spark.

All that ok.

Could it be clogged throttle body. Or faulty fuel pump. Weak?

[jamesslcx]

Does your van have a fuel filter in the fuel line? Sure does sound like a weak pump, with so low a fuel pressure.

[alloro]

Originally Posted by benjaminjb

With fuel pressure reg hose on reads 8-9 psi. Engine slowly shuts off.

You're getting sufficient fuel pressure, why are you focused on the fuel pump as the culprit?

To me it sounds like a clogged catalytic converter.

[benjaminjb]

Yes in line. Fuel filter replaced.when I did initial tune up.

And the manual for the year van it is. Stated fuel pressure has to b @ approximately 14-15 psi with fuel pressure regulator hose connected

And it says it has to read approximately 21psi when fuel pressure regulator hose disconnected.
8-9 psi with it disconnected sounds way to low.

Can you confirm that 8-9 psi of fuel pressure for TBI is sufficient enough. And where did you get info from. Please post a link proof evidence. Or what you referred to, to say 8-9 psi is good .



Pump is getting 13-14 volts. Low pressure still. Van shut off if I connect fuel pressure regulator.