fuel pump prime / cold start
TECH Veteran
Joined: Apr 2008
Posts: 4,985
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IDK...never did that. Don't know if the needle is "keyed" to only go on one way.
I only replaced the pump itself (not entire assembly) on my Impala. I have replaced entire pump assembly on my other Chevy and gauge/needle worked correctly.
The float lever moves a arm along copper windings which change resistance as that lever moves with the gas level. That signal is sent to gage. I have heard of people replacing pump assemblies and having gage then not read either full or past full
I believe making slight bend adjustments in the float rod can bring the new assembly movement closer to matching so gage reads as it should
Try a google search for aftermarket fuel gage calibrators. I installed one years ago on my Impala to correct my gage but it was for my stock sending unit but I know some who put in new assemblies used it to adjust gages as like yours they were not reading correctly. The source I got mine from is no longer making them. It was a variable resistor I wired inline to my gage feed
I only replaced the pump itself (not entire assembly) on my Impala. I have replaced entire pump assembly on my other Chevy and gauge/needle worked correctly.
The float lever moves a arm along copper windings which change resistance as that lever moves with the gas level. That signal is sent to gage. I have heard of people replacing pump assemblies and having gage then not read either full or past full
I believe making slight bend adjustments in the float rod can bring the new assembly movement closer to matching so gage reads as it should
Try a google search for aftermarket fuel gage calibrators. I installed one years ago on my Impala to correct my gage but it was for my stock sending unit but I know some who put in new assemblies used it to adjust gages as like yours they were not reading correctly. The source I got mine from is no longer making them. It was a variable resistor I wired inline to my gage feed
Thread Starter
TECH Regular
Joined: May 2005
Posts: 470
Likes: 4
Now -- the fuel door won't close all the way (the filler sleeve is sticking out and won't go any further since this repair).
I am thinking of 2 things -- 1) filler neck got bent; 2) tank is not reinstalled properly.
Any ideas? Obviously I am bringing it back for this fuel door issue but need some "ammunition" in case I am challenged or told "sorry but we can't get it any better".
no you should not smell gas, there is likely a rubber seal where the fuel pump installed. If you smell fuel around the gas tank now especially if you didn't before then its leaking fuel. park car in a non-windy place like a garage and smell for fuel leaks.
