98 s10 with 4.3 vortec wont start

Asked by Apr 27, 2016 at 09:06 PM about the 1998 Chevrolet S-10 2 Dr LS Extended Cab SB

Question type: Maintenance & Repair

my factory fuel pump went out i
put a after market inline pump
on but it wont start

18 Answers

100,445

Did you modify the pickup in the fuel tank so it would draw fuel? if your trying to draw fuel through the stock fuel pump it won't work cause the stock pump has a check valve in it that prevents fuel from getting sucked out that way.

Best Answer Mark helpful
73,795

Do a fuel pressure bleed down test. Hook a fuel pressure gauge up to the Schrader valve and cycle the key on, off until fuel pressure builds up. It should be 56 to 63 lbs. With the key off watch the fuel pressure, it should not drop more than 5 lbs in 3 minutes. If it does, then the spider injection system would have to be replaced.

73,795

Good answer tennisshoes...

100,445

Been there, done that. I just hope you got the high pressure inline pump or it will never work. Last time I checked they were just as expensive as a stock fuel pump assembly.

i got fuel goin to it with the inline pump and i put new spider injectors in it because i thought thays why it wouldnt start i can press the valve and has spews out would i have to disconect factory pump for it to work properley

100,445

What is the output pressure of the inline pump? It has to have a minimum of 58 lbs for it to work on a Vortec. To use a inline pump you will have to do away with the stock fuel pump and put a pickup tube with a strainer on the end in it's place.

ok ill check the pressure if it dont have enough what do u recomend goin back with factory or inline pump

100,445

Back to factory.

my haynes manual is sayin for a TBI 9-13 psi for fuel pressure

73,795

1998 Vortec does not have a TBI set-up, it is a MPFI. that requires the 56 to 63 lbs of fuel pressure. 1995 was the last year for a TBI set-up.

mine is a 98 but they guy before me put over sized cam and pistons it has the TBI set up

100,445

But you stated it had spyder injectors so it can't be TBI.

73,795

Best post a picture of the top of the motor with the air cleaner off, it would save a lot of questions. But check that fuel pressure.

yes spider injector but where mass air flow hook up it looks like a carburator or throttle body idk if thats TBI was goin by what someone told me he said it was TBI idk can u tell me how to tell diference plz srry im confused now

and tx for helpin i will post pics so u can help more

100,445

TBI Injection pic

1 of 1 people found this helpful.
100,445

spyder injection pic

1 of 1 people found this helpful.

its the second pic srry for confusion i knew it had spider injectors but a guy told me that i had a TBI all i have ever worked on were carburator or ones with a fuel rail this is new to me

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