Lift pump or Injector pump?

[mike r]

Hi guys, I'm new to this column but my friend at work bought a 94 auto 4x4 w/64k on the clock and won't start cold for 25-30 seconds. Says it's better when it's warmed up. Do these things have lift pumps? It's all stock and bought it off the original owner. Thanks

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'99 QC SB White/Agate Auto 3. 54's Mustang Bed Cover, Bed Liner,BD PNP, 4" ex, 275 injectors, ISSPRO PYRO/BOOST A-Pillar,LOUD JVC CD, boost module and elbow coming soon. transmission upgrades needed soon

 

[Joe G.]

Mike,

There are a few things that can cause this. The most probable cause is that it's loosing prime so it takes a while to overcome that. There are a couple of rubber hoses, supply and return, that connect the fuel tank to the engine. These start to leak, especially the return, after a while and have to be replaced. Big PITA of a job. Search the 12V formum and archive to find more than you ever wanted to know about how to do it. The other possibility is the overflow valve on the injector pump. Another search will find a lot about this critter too.

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Joe George
Eureka, CA

'95 2500 CC auto 4X4,3. 54,Combo EGT/boost guage,custom switch panel,PacBrake,TST #5,DTT TC/VB,Automatic motorhome steps on both sides,Foldacover hard bed cover,Cummins chrome kit,Black steel grill guard,Front hitch receiver

[This message has been edited by Joe G. (edited 05-02-2001). ]

 

[Missouri Mule]

I'll second Joe seems like loosing prime.
Next time before he tries to start it have him push in/out the primer button about 30 times or until it hard to push in(or overflow valve makes noise).
This will give him a better idea if there is a leak or the overflow valve.
If the overflow valve is bad, pressure mite not build up when priming
Also could be leaking fuel filter(drain valve) or gasket(o-ring).



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Bill Thomas
Missouri Mule - 96 Wht 4X4 ST CC,5 spd, 3. 54, 8 ft bed, 1 ft high cheater boards.
99 Freightliner bl/wht FL60 ISB-5. 9 24v,215 hp,520 tq,6 spd, 3. 59 nsr,16 ft box, 19. 5 tires,Wt/gvw 11,000/23000