1999 ford F150 starting problems
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Joined: Oct 2008
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not relays still has the problem.... the internal pump i take it that that line is in the tank right on the top of the pump? went to start it, would not start 3 times then i turned the key fast 4 or 5 times and it started right up this is killing me haha
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Joined: Oct 2008
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i don't think its your fuses if they couldnt handle the current they would blow however you do need the right fuses in there lol. does it run good when you do start it after a good drive? if it does i doubt its your fuel pump. does it have after market battery connecters on it ? if so make sure its the light strap type connecter with the set screw. i posted a thread about this and some people left some interesting posts on the subject.turn your key to the run position not start position you should hear the pump humm every time for 1-2 secounds thats the fuel pump primeing if you dont hear the pump have someone hold there hand on the relays under the hood and turn the key to the run position they should feel the relays click under there hand. if not try swapping the relays and try again. if you do hear the pump in the run position turn it run and off letting it prime each time 4 or 5 times and see if it starts then if it does then you have fuel pressure problem at the pump or regulator. im by no means an expert just my 2 cents worth hope this helps and good luck.
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Joined: Oct 2009
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From: JACKSON TENNESSEE
jbrew might be on to something here with the internal pump line bursting / leaking he put some pics up on my thread from a couple of days ago that shows the line he is talking about. the tread is ( help with fuel pump replacement ) sounds to me like you have running fuel pressure but not enough starting pressure sounds to me like a weak fuel pump. go to auto zone rent a fuel pressure gauge (you get your money back after you return it) and check it at the fuel rail not sure whats the right pressure is but auto zone can look it up for you. while your there have them run your codes form your PCM and post any here. you can also try a complete reboot of your PCM by takeing both the neg and pos battery cables off for 20 min when you go to start it you will see your gauges sweep and reset. its a shot in the dark but what do you have to lose. good luck and keep us posted.
Last edited by rglass62; Aug 2, 2010 at 05:33 PM.
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I had same problem,
my girlfriend had a 99 f150 she will turn the ket to start her truck and the truck will crank crank and crank but wont start.... i would turn the key back and forth really fast like 8 times then the truck will start right up.... so i switched out the ignition box on the steering column and it worked for couple days then back to not starting. NO enging codes no nothing what the hell could it be any one have any idear or have ever had this problem please help!
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Joined: Oct 2002
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From: St. Louis (Out in the woods)
NEVER disconnect the positive cable first, disconnect the NEGATIVE cable first.
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Joined: Nov 2013
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From: Fort Worth Texas
If no start spray a little carb cleaner or brake cleaner into intake and see if it starts. If it light right up problem is fuel related.Just don't spray into any vehicle ahead of a hot wire mass air flow sensor. In this case use a large vacuum lint to spray in. (booster hose works good) This is an old quick and dirty test to save diagnostic time. A hot relay can also indicate a pump with excessive draw. Relays should not get hot under normal operating conditions.