2001 GMC cranks but will not start on 2000 GMC Savana 3500

Have spark and turn on truck and fuel pump works and getting gas out of fuel filter. Engine will fire on either but not stay running

by in East Peoria, IL on December 16, 2012
4 answers
ANSWER by on December 16, 2012
My guess is fuel pump is weak, need to know how much pressure it has! JUST REPLACE THE PUMP! GM 11 years old, i bet that is what it is going to take to fix your truck!!! Done been there lots of times. It can be off by 3 psi. and it aint going to run!
ANSWER by on December 16, 2012
Got PULSE?....... Are injectors working? If it has fuel pressure and spark and will run by spraying ether or carb. spray into it , then maybe no signal to injectors?.....No air leaks between mass air flow and throttle body? That will also stop or greatly reduce fuel delivery. Do you have 2 vans both a 2000 and a 2001? your post has both years on it and if you do and they are both 5.7L , then maybe you can swap MAF and see if that does the trick.
1 person likes thisFlag inappropiateReply
ANSWER by on December 17, 2012
Need to perform a fuel pressure and volume test with a fuel pressure test gage.
1 person likes thisFlag inappropiateReply
ANSWER by on December 17, 2012
poss low fuel pressure even though you have some pressure you may not have enough to stsrt
1 person likes thisFlag inappropiateReply
Related Items:
she started last night, but now fuel gauge pegged and will not start. fuel gauge not pegged will start. HELP! thanks
checked fuel pressure...power to the coil/icm/cam sensor/switch the crank sensor with a working one.no spark from the coil.any help...looking in to changing the computer