Doubtful you have a fuel pressure problem if the car runs well, poor starting can be a few things , poor air circulation air filter needs cleaning or replacing, poor injector flow warn injectors or just dirty fuel additive sometimes clears this , poor spark plugs not firing under pressure ok when started . for diesel cars you don't say what car it is , poor glow plugs . bad fuel filter , air leaks in fuel pump , poor injectors . and especially with diesel poor compression due to worn rings or head gasket failure . You may even have just have disturbed the engine earth strap when you replaced your starter motor .
SOURCE: 1998 Chevy tahoe Hard to start when cold
Hello, yes the check valve is in the fuel pump assembly. The check valve is leaking and the pump will burn out soon. Unfortunately the aftermarket fuel pumps can be very unreliable. A good portion of problems we see on this site are from people who replace the pump sometimes twice and it still doesn't work.
SOURCE: 1998 Chevy tahoe Hard to start when cold
replace your MAP sensor(manifold absolute pressure) the map sensor is the computer for your fuel pressure regulator telling how much pressure. Unless your tahoe runs like **** going up hill than it inevitably your fuel pump
SOURCE: 91 f150 4.9L no visible timing marks, hard start runs rough.
I have wondered why this happens many times in the past. You would think the marks should line up using #1 cylinder but they don't.
It has been a while but I think if you hook up to #5 ignition wire the marks will come up for you.You will need to undo the "spout" connector before setting it to 10 degrees before top dead center. The spout is a two wire jumper clip that should break out of the harness at the distributor.
Warm the engine up for a while so it doesn't stall as easy while you set the timing.
Testimonial: " Right on, timing it on #5 cylinder worked. I thought I probably had a bad damper but it appears o.k. "
SOURCE: Correct fuel pressure on the 5.7 in my 1999 gmc 3500 van?
Check the TPS. If you code the ECU there might be a P121 stored in the OBD2 port. If tere is no code the a cloged converter will be your best bet.
SOURCE: hard starting after setting for a while, seems
the EGR valve needs to be changed out.........Hope this helps.
Testimonial: "will change wth tune up"
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