1990 fleetwood with 454 no fuel issue

[pimpinfresh1986]

I have a 1990 Fleetwood flair with a 454 tbi so far I have replaced fuel filter, ignition control module, injectors checked all fuses and still im getting no initial primer shot but if I pour gas in it it will start and then stall soon as gas runs out could it be the ecu or ecm and what is the fuel pressure supposed to be and could it be something else and do I have to have both batteries to run

[summerwinds48]

Fuel pump went out three times in the last three years on my '94 Itasca Chevy P30, 454. Last time replaced the sender unit which holds the pump and the tank fuel level device. Seems there was a corrosion problem on the connectors caused by the ethanol gas, and the ground at the top of the tank area was very rusted and corroded, causing bad current and voltage supply to the fuel pump and fuel guage system. Been running for a year now with no further problems.

[Ozlander]

If you have a TBI, then there's two fuel lines at the TBI. I believe the larger is the return line.

[enblethen]

I would use some compressed air and blow from the engine back toward the filter. TBI units do not have the small ceramic or paper filter as in the old Quadra-jet.
You said that you have a 1990 TBI and then you said carb, It is one or the other!

[bgbevan]

I just replaced the fuel pump in my 1990 TBI Chevy/Southwind. Ugly job because the pump is in the fuel tank. However, when I was troubleshooting the problem, I could hear the pump running and there was some gas coming out of the in-line filter when I loosened the connections. I disconnected the line at the carburetor and there was no fuel getting in so that would be a good next step. Also, don't some fuel systems have a small filter inside the carburetor that is part of the flare receiver where the fuel line attaches? Just a few thoughts.

[PaulJ2]

pimpinfresh1986 wrote:
the only thing that I did not check is the crank position sensor and the camshaft position sensor

I believe you might find your problem being the cam position sensor located in the distributor. It's job is to fire the fuel injectors at the proper time.
Crank position sensor controls the ignition timing.

[enblethen]

OP says he has TBI and not carb. 1989 had carb for most of year and 1990 has TBI.
If it is a carb, there could be a second filter on the fuel connection on the card.
It could be a needle and seat stuck not allowing fuel into the bowl or the float is stuck in the up position.
OP:
Does your carb throttle body have two injectors at the top with four wires, two to each injector?

[enblethen]

You do not need a code reader to get the codes.
Locate the OBD I connector, normally located on left side of the steering column at bottom of dash.
the connector has a straight side and a side with rounded corners. on the left end of the straight side, install a jumper, paper clip or short piece of wire between the bottom two pin locations.
Turn the ignition key to "ON". Watch the engine check light. It will begin to flash the codes. It will flash first number then pause, then flash second number. It will go through the system and give all codes. It will repeat the codes a three times.
For example it will flash once then pause then flash twice. That is code 12

[okhmbldr]

Sounds to me like there is a blockage from the fuel filter to the carburetor. You stated that at the fuel filter it sprays out, so the pump is working. But evidently fuel is not getting up to the carb. Why not disconnect the fuel line from the carb, disconnect at the filter, and blow air thru the line from the carb end out the filter end. OH, did you check the fuel filter?

[pimpinfresh1986]

the only thing that I did not check is the crank position sensor and the camshaft position sensor

[pimpinfresh1986]

replaced all sensors fuel pump relay switch oil pressure switch icm ecm fuel filter injectors all the fuses under the dog house are good and under the hood getting 12psi at the throttle body but still no fuel when I first turn on key to prime system for start up can pour gas in tbi and runs as long as I keep feeding it gas I stomped it had always had a check engine light on and no I didn't check for codes no box to do so and I live in the sticks someone plz help!!!!!

[darsben]

1990 fleetwood + 1989 P30 chassis,
SO a carburated engine..
Besides fuel pump there is a pressure regulator mounted on the right side frame near the fuel tank

Looks something like this

Image here

[ScottG]

Common cause is the fuel pump and fuel pump relay. Replace both at the same time.

[enblethen]

The pump should only run for a few seconds when you turn on the key, then stop. The engine would normally crank over and fire, get oil pressure and the fuel pump would run via the oil sending unit.
I did find in my cheapie book the fuel pressure for 1990 needs to be between 9-13 PSI for TBI systems. In 1992 pressure is a little higher 26-32 for TBI, in 1996 went to 60-66, but that is multi point injection.
Did you check the crank position sensor? It is located under the balance adjuster on the front of the engine.
Camshaft position sensor? it is located inside the distributor.

[turbojimmy]

Nick-B wrote:
Fuel pressure for most fuel injection systems should be more like 40psi. Is the Chevy TBI really supposed to be that low?

I wondered that myself. I think '90 was the first year for the TBI. I would think FP should be higher. Between 1985 1/2 and 1989 they had electric pumps feeding the carb, which would have been low pressure.