New to the V10.. Low fuel pressure
HI everyone. We recently purchased a 2001 motorhome that's based on the F53 with a V10. I noticed that it seems to be hard to start and while it has a strong cranking action, it takes a bit to get it ...
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You should take a fuel pressure reading with the return line clamped shut with a vise grip. This will tell if the pump is bad.
Could it be you fuel system check valve(in the pump) is bad, letting fuel drain back, and that is why you have the long crank times.
You said specs were 30 - 45 right?
Also, never replace a electric fuel pump without first checking voltage drop with a digital multimeter.
To do a voltage drop check:
- Jumper the fuel pump on at the relay.
- Take a long jumper wire lead and hook it to battery POS.
- Hook you meter neg to the long jumper lead.
- Hook you meter pos to the feed(pos) terminal at or near the pump.
- Your volt reading on the meter should be .05 or less.
- A higher read means the wire to the pump is bad.
You can do the same procedure for the fuel pump ground.
You can find this explained here:
Schrodingers Box - Youtube auto repair help
and here
ScannerDanner - YouTube Auto Repair
Never use a test light on a computer driver circuit.(You can fry it. Use a DVM only. This is computer driven.)
What that said, I think you do have a bad fuel pump. It should hold fuel pressure when off.
I did find this:
Article for Ford Chassis hard start diagnosing.
Could it be you fuel system check valve(in the pump) is bad, letting fuel drain back, and that is why you have the long crank times.
You said specs were 30 - 45 right?
Also, never replace a electric fuel pump without first checking voltage drop with a digital multimeter.
To do a voltage drop check:
- Jumper the fuel pump on at the relay.
- Take a long jumper wire lead and hook it to battery POS.
- Hook you meter neg to the long jumper lead.
- Hook you meter pos to the feed(pos) terminal at or near the pump.
- Your volt reading on the meter should be .05 or less.
- A higher read means the wire to the pump is bad.
You can do the same procedure for the fuel pump ground.
You can find this explained here:
Schrodingers Box - Youtube auto repair help
and here
ScannerDanner - YouTube Auto Repair
Never use a test light on a computer driver circuit.(You can fry it. Use a DVM only. This is computer driven.)
What that said, I think you do have a bad fuel pump. It should hold fuel pressure when off.
I did find this:
Article for Ford Chassis hard start diagnosing.
