Fuel pump

MIKYSPIKY

MEMBER
1998 PLYMOUTH BREEZE
156,000 MILES

Took fuel pump out of tank hooked straight up to a battery it ran took a test light to the connector to the cars harness to fuel pump and theirs power but wont ingauge could it be some where in the camshaft sensor ASD relay switch and coil their is no spark but engine turn and took the test light to circuit board under hood and everthing lights up besides the downstream sensor and im wondering if it could be a linkable fuse

Tuesday, March 27th, 2012 AT 2:30 AM

3 Replies

DRCRANKNWRENCH

MECHANIC
3,380 POSTS

If there is power in the car's harness at the connector, everything in the car should be okay.
When you are hooking up the fuel pump straight to the battery it has much more amperage than it should have. It may turn when it would normally be locked up. It may be worn out and barely turning under the correct amperage coming from the harness. But when given the massive amperage at the battery, it turns without an issue. It just won't do so for long.
The thing is, how many amps do you have at the connector? I know most multi-testers are only fused to 10 Amps if that. When the pump is hooked up to the harness I assume it does not turn. Does it turn if you hit it with a hammer while it is hooked up or does it trun slowly?
I think it may be the pump as the things you mentioned would give you 0 Volts at the connector.

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Tuesday, March 27th, 2012 AT 2:51 AM

MIKYSPIKY

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7 POSTS

I just installed a new fuel pump

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Tuesday, March 27th, 2012 AT 2:57 AM

DRCRANKNWRENCH

MECHANIC
3,380 POSTS

I have had it happen twice to me with new fuel pumps and both were Walbros. There is something about starting them up before they get fuel in them that is really tough on them for some reason.
Try tapping on the pump while enrgized with the butt of a screwdriver and see if the armature will move.

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Tuesday, March 27th, 2012 AT 4:32 AM