gas tank sending uint

[James lebouef]

86 bronco .I  took out the 302efi and replaced w/a 351widsormy sending unit went out so I replaced it, now I'm getting a false reading. should I have changed the pig tail on the sending unit cause the old one has a 3pin connector and the new one has only two. if someone could email me @[email protected]

 

[Rons beast]

Are you sure you got the correct new part?  Parts counter guys have been known to make mistakes.

 

[Seabronc]

Sounds like you got a unit for an  engine with a mechanical pump on the engine block.  The 3 pin connector has one for the tank pump, one for the sender, and a ground.

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[James lebouef]

i do have a mechanical pump i have a 4 barrel carb seabronc.

 and im starting to think that LCM sent me the wrong part too  Ronbest . thanks guys nothing like dropping a full 33 gallon tank again

 

[Seabronc]

In that case, you did get the correct part for a carbed engine.  If you are converting from a in tank pump, which the 302 had,  to a mechanical pump you need to make sure that the correct wire from your truck's pigtail goes to the sending unit.  Also you need to eliminate the high pressure pump on the frame rail.

If you want to eliminate the need to drop your tank in the future try this:  http://broncozone.com/topic/12329-gas-sender-unit-access-panel/ 

Wiring diagram with a mechanical pump,  it shows both the F-series dual tank and single tank  connections.

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